COMMON UNIT PURCHASE AGREEMENT

Exhibit 10.1

COMMON UNIT PURCHASE AGREEMENT

CROSSTEX ENERGY, L.P.

and

Table of Contents

ARTICLE I
DEFINITIONS
Section 1.01 Definitions			1
Section 1.02 Accounting Procedures and Interpretation			5
ARTICLE II
AGREEMENT TO SELL AND PURCHASE
Section 2.01 Authorization of Sale of the Purchased Units			5
Section 2.02 Sale and Purchase			5
Section 2.03 Closing			5
Section 2.04 Conditions to Closing			5
Section 2.05 Crosstex Deliveries			6
Section 2.06 Purchasers’ Deliveries			7
Section 2.07 Independent Nature of Purchasers’ Obligations and Rights			7
ARTICLE III
REPRESENTATIONS AND WARRANTIES AND COVENANTS RELATED TO CROSSTEX
Section 3.01 Partnership Existence			8
Section 3.02 Capitalization and Valid Issuance of Purchased Units			8
Section 3.03 Registration Statement and Prospectus			10
Section 3.04 Crosstex SEC Documents			10
Section 3.05 No Material Adverse Change			11
Section 3.06 Litigation			11
Section 3.07 No Conflicts; Compliance with Laws			11
Section 3.08 Authority, Enforceability			12
Section 3.09 Approvals			12
Section 3.10 MLP Status			12
Section 3.11 Investment Company Status			12
Section 3.12 Certain Fees			12
Section 3.13 No Side Agreements			12
Section 3.14 Insurance			13
Section 3.15 Internal Accounting Controls			13
Section 3.16 Form S-3 Eligibility			13
Section 3.17 Listing and Maintenance Requirements			13
Section 3.18 Material Agreements			13
Section 3.19 Subsequent Offerings			13
Section 3.20 Confidential Information			13
Section 3.21 Further Agreements of Crosstex			13

ARTICLE IV
REPRESENTATIONS AND WARRANTIES AND COVENANTS OF THE PURCHASERS
Section 4.01 Existence			14
Section 4.02 Authorization, Enforceability			14
Section 4.03 No Breach			14
Section 4.04 Certain Fees			14
Section 4.05 No Side Agreements			14
Section 4.06 Lock-Up Agreement			15
Section 4.07 Short Selling			15
Section 4.08 Crosstex Information			15
ARTICLE V
INDEMNIFICATION, COSTS AND EXPENSES
Section 5.01 Indemnification by Crosstex			16
Section 5.02 Indemnification by the Purchasers			16
Section 5.03 Indemnification Procedure			16
ARTICLE VI
MISCELLANEOUS
Section 6.01 Interpretation and Survival of Provisions			17
Section 6.02 Survival of Provisions			17
Section 6.03 No Waiver; Modifications in Writing			18
Section 6.04 Binding Effect; Assignment			18
Section 6.05 Non-Disclosure			18
Section 6.06 Communications			19
Section 6.07 Entire Agreement			20
Section 6.08 Governing Law			20
Section 6.09 Waiver of Jury Trial			20
Section 6.10 Execution in Counterparts			20

Exhibit A — Form of Opinion of Crosstex Counsel

COMMON UNIT PURCHASE AGREEMENT

     This COMMON UNIT PURCHASE AGREEMENT, dated as of April 8, 2008 (this “ Agreement ”), is by and between CROSSTEX ENERGY, L.P., a Delaware limited partnership (“ Crosstex ”), and each of the purchasers set forth in Schedule A hereto (the “ Purchasers ”).

     WHEREAS, Crosstex has filed with the Commission (as defined below), pursuant to the Securities Act (as defined below) and the rules and regulations adopted by the Commission thereunder, the Registration Statement (as defined below) relating to the offer and sale from time to time of up to $500,000,000.00 aggregate initial offering price of common units representing limited partner interests in Crosstex (“ Common Units ”) and certain other Crosstex securities, and such Registration Statement has become effective; and

     WHEREAS, Crosstex desires to sell to each of the Purchasers, and each of the Purchasers desires, severally and not jointly, to purchase from Crosstex, certain of those Common Units, in accordance with the provisions of this Agreement.

     NOW THEREFORE, in consideration of the mutual covenants and agreements set forth herein and for good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereby agree as follows:

ARTICLE I
DEFINITIONS

     Section 1.01 Definitions . As used in this Agreement, and unless the context requires a different meaning, the following terms have the meanings indicated:

     “ Affiliate ” means, with respect to a specified Person, any other Person, directly or indirectly controlling, controlled by or under direct or indirect common control with such specified Person. For purposes of this definition, “control” (including, with correlative meanings, “controlling,” “controlled by,” and “under common control with”) means the power to direct or cause the direction of the management and policies of such Person, directly or indirectly, whether through the ownership of voting securities, by contract or otherwise.

     “ Allocated Purchase Price ” means with respect to each Purchaser, the dollar amount set forth opposite such Purchaser’s name under the heading “Allocated Purchase Price” on Schedule A hereto.

     “ Basic Documents ” means, collectively, this Agreement, the Partnership Agreement, the Non-Disclosure Agreement and any and all other agreements or instruments executed and delivered to the Purchasers by Crosstex or any Subsidiary of Crosstex hereunder or thereunder.

     “ Business Day ” means any day other than a Saturday, Sunday, any federal legal holiday or day on which banking institutions in the State of New York or State of Texas are authorized or required by law or other governmental action to close.

     “ Closing ” shall have the meaning specified in Section 2.03 .

     “ Closing Date ” shall have the meaning specified in Section 2.03 .

     “ Commission ” means the United States Securities and Exchange Commission.

     “ Common Units ” has the meaning set forth in the recitals.

     “ Company Lock-Up Date ” means 90 days from the Closing Date.

     “ Crosstex ” has the meaning set forth in the introductory paragraph.

     “ Crosstex Credit Facility ” means the Fourth Amended and Restated Credit Agreement, dated as of November 1, 2005, by and among Crosstex and the lenders named therein, as amended as of the date hereof.

     “ Crosstex Financial Statements ” shall have the meaning specified in Section 3.04 .

     “ Crosstex Master Shelf Agreement ” means the Amended and Restated Note Purchase Agreement, dated as of July 25, 2006 among Crosstex Energy, L.P., Prudential Investment Management, Inc. and certain other parties, as amended as of the date hereof.

     “ Crosstex Material Adverse Effect ” means any material and adverse effect on (a) the assets, liabilities, financial condition, business, operations, affairs or prospects of Crosstex and its Subsidiaries taken as a whole; (b) the ability of Crosstex and its Subsidiaries taken as a whole to carry out their business as such business is conducted as of the date hereof or to meet their obligations under the Basic Documents on a timely basis; or (c) the ability of Crosstex to consummate the transactions under any Basic Document; provided , however , that a Crosstex Material Adverse Effect shall not include any material and adverse effect on the foregoing to the extent such material and adverse effect results from, arises out of, or relates to (x) a general deterioration in the economy or changes in the general state of the industries in which the Crosstex Parties operate, except to the extent that the Crosstex Parties, taken as a whole, are adversely affected in a disproportionate manner as compared to other industry participants, (y) the outbreak or escalation of hostilities involving the United States, the declaration by the United States of a national emergency or war or the occurrence of any other calamity or crisis, including acts of terrorism, or (z) any change in accounting requirements or principles imposed upon Crosstex and its Subsidiaries or their respective businesses or any change in applicable Law, or the interpretation thereof.

     “ Crosstex Parties ” means Crosstex, the General Partner, and all of Crosstex’s Subsidiaries.

     “ Crosstex Related Parties ” shall have the meaning specified in Section 5.02 .

     “ Crosstex SEC Documents ” shall have the meaning specified in Section 3.04 .

     “ Delaware LLC Act ” shall have the meaning specified in Section 3.02 .

     “ Delaware LP Act ” shall have the meaning specified in Section 3.02 .

     “ Effective Date ” shall have the meaning specified in Section 3.03 .

     “ Effective Time ” shall have the meaning specified in Section 3.03 .

     “ Exchange Act ” means the Securities Exchange Act of 1934, as amended from time to time, and the rules and regulations of the Commission promulgated thereunder.

     “ GAAP ” means generally accepted accounting principles in the United States of America in effect from time to time.

     “ General Partner ” means Crosstex Energy GP, L.P., a Delaware limited partnership, and includes Crosstex Energy GP, LLC, a Delaware limited liability company and the general partner of Crosstex Energy GP, L.P.

     “ Governmental Authority ” means, with respect to a particular Person, any country, state, county, city and political subdivision in which such Person or such Person’s Property is located or which exercises valid jurisdiction over any such Person or such Person’s Property, and any court, agency, department, commission, board, bureau or instrumentality of any of them and any monetary authority which exercises valid jurisdiction over any such Person or such Person’s Property. Unless otherwise specified, all references to Governmental Authority herein with respect to Crosstex means a Governmental Authority having jurisdiction over Crosstex, its Subsidiaries or any of their respective Properties.

     “ Indemnified Party ” shall have the meaning specified in Section 5.03 .

     “ Indemnifying Party ” shall have the meaning specified in Section 5.03 .

     “ Law ” means any federal, state, local or foreign order, writ, injunction, judgment, settlement, award, decree, statute, law, rule or regulation.

     “ Lien ” means any mortgage, claim, encumbrance, pledge, lien (statutory or otherwise), security agreement, conditional sale or trust receipt or a lease, consignment or bailment, preference or priority or other encumbrance upon or with respect to any property of any kind.

     “ NASDAQ ” means the NASDAQ Global Select Market.

     “ Non-Disclosure Agreement ” means the Letter Agreement, dated March 31, 2008, by and between Kayne Anderson Capital Advisors, L.P. and Crosstex.

     “ Partnership Agreement ” means the Sixth Amended and Restated Agreement of Limited Partnership of Crosstex, dated March 23, 2007, as amended from time to time.

     “ Partnership Securities ” means any class or series of equity interest in Crosstex (but excluding any options, rights, warrants and appreciation rights relating to an equity interest in Crosstex), including without limitation Common Units, Senior Subordinated Series D Units and the Incentive Distribution Rights (as defined in the Partnership Agreement).

     “ Person ” means any individual, corporation, company, voluntary association, partnership, joint venture, trust, limited liability company, unincorporated organization, government or any agency, instrumentality or political subdivision thereof, or any other form of entity.

     “ Property ” means any interest in any kind of property or asset, whether real, personal or mixed, or tangible or intangible.

     “ Prospectus ” shall have the meaning specified in Section 3.03 .

     “ Purchase Price ” means $100,000,020.00 which is the aggregate of each Purchaser’s Allocated Purchase Price as set forth on Schedule A hereto.

     “ Purchased Units ” means with respect to each Purchaser, the number of Common Units as set forth opposite such Purchaser’s name on Schedule A hereto.

     “ Purchaser Lock-Up Period ” shall have the meaning specified in Section 4.06 .

     “ Purchaser Related Parties ” shall have the meaning specified in Section 5.01 .

     “ Purchasers ” has the meaning set forth in the introductory paragraph of this Agreement.

     “ Registration Statement ” shall have the meaning specified in Section 3.03 .

     “ Representatives ” of any Person means the officers, directors, managers, employees, agents, counsel, accountants, investment bankers and other representatives of such Person.

     “ Rules and Regulations ” shall have the meaning specified in Section 3.03 .

     “ Securities Act ” means the Securities Act of 1933, as amended from time to time, and the rules and regulations of the Commission promulgated thereunder.

     “ Senior Subordinated Series D Units ” means the senior subordinated Series D units representing limited partner interests in Crosstex and any Common Units into which such Senior Subordinated Series D Units convert.

     “ Subsidiary ” means, as to any Person, any corporation or other entity of which: (i) such Person or a Subsidiary of such Person is a general partner or manager; (ii) at least a majority of the outstanding equity interest having by the terms thereof ordinary voting power to elect a majority of the board of directors or similar governing body of such corporation or other entity (irrespective of whether or not at the time any equity interest of any other class or classes of such corporation or other entity shall have or might have voting power by reason of the happening of any contingency) is at the time directly or indirectly owned or controlled by such Person or one or more of its Subsidiaries; or (iii) any corporation or other entity as to which such Person consolidates for accounting purposes.

     “ Transfer ” shall have the meaning specified in Section 4.06 .

     Section 1.02 Accounting Procedures and Interpretation . Unless otherwise specified herein, all accounting terms used herein shall be interpreted, all determinations with respect to accounting matters hereunder shall be made, and all Crosstex Financial Statements and certificates and reports as to financial matters required to be furnished to the Purchasers hereunder shall be prepared, in accordance with GAAP applied on a consistent basis during the periods involved (except as may be indicated in the notes thereto or, in the case of unaudited statements, as permitted by Form 10-Q promulgated by the Commission) and in compliance as to form in all material respects with applicable accounting requirements and with the published rules and regulations of the Commission with respect thereto.

ARTICLE II
AGREEMENT TO SELL AND PURCHASE

     Section 2.01 Authorization of Sale of the Purchased Units . Crosstex has authorized the issuance and sale to the Purchasers of the Purchased Units.

     Section 2.02 Sale and Purchase . Subject to the terms and conditions hereof, Crosstex hereby agrees to issue and sell to each Purchaser, free and clear of any and all Liens, and each Purchaser, severally and not jointly, hereby agrees to purchase from Crosstex, the number of Purchased Units as set forth on Schedule A (such number of Purchased Units set forth thereon with respect to each Purchaser), and each Purchaser agrees to pay Crosstex its Allocated Purchase Price.

     Section 2.03 Closing . Subject to the terms and conditions hereof, the consummation of the purchase and sale of the Purchased Units hereunder (the “ Closing ”) shall take place at 9:00 a.m., Central Daylight Time, on April 9, 2008 at the offices of Vinson & Elkins L.L.P., First City Tower, 1001 Fannin Street, Houston, Texas 77002, or at such other time and date not later than five (5) full Business Days thereafter as Crosstex and the Purchasers may agree (the “ Closing Date ”). The parties agree that the Closing may occur via delivery of facsimiles of this Agreement and cross-receipts; provided, that originals of such documents are sent via overnight delivery to be received by the other party (or designee of such other party) on the first business day immediately following the Closing Date.

     Section 2.04 Conditions to Closing .

     (a)  Mutual Conditions . The respective obligations of each party to consummate the purchase and issuance and sale of the Purchased Units shall be subject to the satisfaction on or prior to the Closing Date of each of the following conditions (any or all of which may be waived by a particular party on behalf of itself in writing, in whole or in part, to the extent permitted by applicable Law):

          (i) no statute, rule, order, decree or regulation shall have been enacted or promulgated, and no action shall have been taken, by any Governmental Authority which temporarily, preliminarily or permanently restrains, precludes, enjoins or otherwise prohibits the consummation of the transactions contemplated hereby or makes the transactions contemplated hereby illegal; and

          (ii) there shall not be pending any suit, action or proceeding by any Governmental Authority seeking to restrain, preclude, enjoin or prohibit the transactions contemplated by this Agreement.

     (b)  Purchasers’ Conditions . The respective obligation of each Purchaser to consummate the purchase of the Purchased Units shall be subject to the satisfaction on or prior to the Closing Date of each of the following conditions (any or all of which may be waived by such Purchaser in writing, in whole or in part with respect to its Purchased Units, to the extent permitted by applicable Law):

          (i) since the date of this Agreement, no Crosstex Material Adverse Effect shall have occurred and be continuing;

          (ii) no notice of delisting shall have been received by Crosstex;

          (iii) the representations and warranties of Crosstex contained in this Agreement that are qualified by materiality or Crosstex Material Adverse Effect shall be true and correct as of the Closing Date as if made on and as of the Closing Date and all other representations and warranties shall be true and correct in all material respects as of the Closing Date as if made on and as of the Closing Date (except that representations made as of a specific date shall be required to be true and correct as of such date only); and

          (iv) Crosstex shall have delivered, or caused to be delivered, to the Purchasers at the Closing, Crosstex’s closing deliveries described in Section 2.05 .

     (c)  Crosstex’s Conditions . The obligation of Crosstex to consummate the sale of the Purchased Units to each Purchaser shall be subject to the satisfaction on or prior to the Closing Date of the following condition (which may be waived by Crosstex in writing, in whole or in part, to the extent permitted by applicable Law): the representations and warranties of such Purchaser contained in this Agreement shall be true and correct in all material respects at and as of the Closing Date as if made on and as of the Closing Date (except that representations made as of a specific date shall be required to be true and correct as of such date only).

     Section 2.05 Crosstex Deliveries . At the Closing, subject to the terms and conditions hereof, Crosstex will deliver, or cause to be delivered, to the Purchasers:

     (a) The Purchased Units by electronic delivery to The Depository Trust Company on Purchasers’ behalf, registered in such name(s) as Purchasers have designated;

     (b) Copies of (i) the Certificate of Limited Partnership of Crosstex, (ii) the Certificate of Limited Partnership of Crosstex Energy GP, L.P. and (iii) the Certificate of Formation of Crosstex Energy GP, LLC, each certified by the Secretary of State of the jurisdiction of its formation as of a recent date;

     (c) A certificate of the Secretary of State of the State of Delaware, dated a recent date, that Crosstex is in good standing;

     (d) A cross-receipt executed by Crosstex and delivered to each Purchaser certifying that it has received the Allocated Purchase Price with respect to such Purchaser as of the Closing Date;

     (e) An opinion addressed to the Purchasers from legal counsel to Crosstex, dated as of the Closing Date, in the form and substance attached hereto as Exhibit A ;

     (f) A copy of the final prospectus supplement relating to the Purchased Units and the offering thereof, including the accompanying base prospectus, substantially in the form that will be filed with the Commission pursuant to Rule 424(b) of the Rules and Regulations after the date and time this Agreement is executed;

     (g) A certificate of the Secretary or Assistant Secretary of Crosstex Energy GP, LLC, on behalf of Crosstex, certifying as to and attaching (1) the Partnership Agreement, (2) board resolutions authorizing the execution and delivery of the Basic Documents and the consummation of the transactions contemplated thereby, including the issuance of the Purchased Units and (3) its incumbent officers authorized to execute the Basic Documents, setting forth the name and title and bearing the signatures of such officers; and

     (h) A certificate, dated the Closing Date and signed by (x) the Chief Executive Officer and (y) the Chief Financial Officer of Crosstex Energy GP, LLC, in their capacities as such, stating that:

          (i) Crosstex has performed and complied with the covenants and agreements contained in this Agreement that are required to be performed and complied with by Crosstex on or prior to the Closing Date;

          (ii) The representations and warranties of Crosstex contained in this Agreement that are qualified by materiality or Crosstex Material Adverse Effect were true and correct when made and as of the Closing Date and all other representations and warranties were true and correct in all material respects when made and are true and correct in all material respects as of the Closing Date, in each case as though made at and as of the Closing Date (except that representations made as of a specific date shall be required to be true and correct as of such date only).

     Section 2.06 Purchasers’ Deliveries . At the Closing, subject to the terms and conditions hereof, each Purchaser will deliver, or cause to be delivered, to Crosstex:

     (a) Payment to Crosstex of each Purchaser’s Allocated Purchase Price by wire transfer of immediately available funds to an account designated by Crosstex in writing at least two Business Days prior to the Closing Date; and

     (b) A cross-receipt executed by each Purchaser and delivered to Crosstex certifying that it has received its respective Purchased Units as of the Closing Date.

     Section 2.07 Independent Nature of Purchasers’ Obligations and Rights . The obligations of each Purchaser under any Basic Document are several and not joint with the obligations of any other Purchaser, and no Purchaser shall be responsible in any way for the

performance of the obligations of any other Purchaser under any Basic Document. The failure or waiver of performance under any Basic Document by any Purchaser does not excuse performance by any other Purchaser. Nothing contained herein or in any other Basic Document, and no action taken by any Purchaser pursuant thereto, shall be deemed to constitute the Purchasers as a partnership, an association, a joint venture or any other kind of entity, or create a presumption that the Purchasers are in any way acting in concert or as a group with respect to such obligations or the transactions contemplated by the Basic Documents. Each Purchaser shall be entitled to independently protect and enforce its rights, including without limitation, the rights arising out of this Agreement or out of the other Basic Documents, and it shall not be necessary for any other Purchaser to be joined as an additional party in any proceeding for such purpose.

ARTICLE III
REPRESENTATIONS AND WARRANTIES AND COVENANTS
RELATED TO CROSSTEX

     Crosstex represents and warrants to and covenants with each Purchaser as follows:

     Section 3.01 Partnership Existence . Crosstex (a) is a limited partnership duly formed, validly existing and in good standing under the laws of the State of Delaware; and (b) has all requisite power and authority, and has all governmental licenses, authorizations, consents and approvals necessary, to own, lease, use and operate its Properties and carry on its business as its business is now being conducted, except where the failure to obtain such licenses, authorizations, consents and approvals would not be reasonably likely to have a Crosstex Material Adverse Effect. Each of Crosstex’s Subsidiaries has been duly incorporated or formed, as the case may be, and is validly existing and in good standing under the laws of the State or other jurisdiction of its incorporation or organization, as the case may be, and has all requisite power and authority, and has all governmental licenses, authorizations, consents and approvals necessary, to own, lease, use or operate its respective Properties and carry on its business as now being conducted, except where the failure to obtain such licenses, authorizations, consents and approvals would not be reasonably likely to have a Crosstex Material Adverse Effect. None of Crosstex nor any of its Subsidiaries are in default in the performance, observance or fulfillment of any provision of, in the case of Crosstex, the Partnership Agreement or its Certificate of Limited Partnership or, in the case of any Subsidiary of Crosstex, its respective certificate of incorporation, certification of formation, bylaws, limited liability company agreement or other similar organizational documents. Each of Crosstex and its Subsidiaries is duly qualified or licensed and in good standing as a foreign limited partnership, limited liability company or corporation, as applicable, and is authorized to do business in each jurisdiction in which the ownership or leasing of its respective Properties or the character of its respective operations makes such qualification necessary, except where the failure to obtain such qualification, license, authorization or good standing would not be reasonably likely to have a Crosstex Material Adverse Effect.

     Section 3.02 Capitalization and Valid Issuance of Purchased Units.

      (a) As of the date of this Agreement, prior to the issuance and sale of the Purchased Units, as contemplated hereby, the issued and outstanding limited partner interests of Crosstex consist of 41,472,820 Common Units, 3,875,340 Senior Subordinated Series D Units and the Incentive Distribution Rights (as defined in the Partnership Agreement). The only issued and outstanding general partner interests of Crosstex are the interests of the General Partner described in the Partnership Agreement. All

outstanding Common Units, Senior Subordinated Series D Units and Incentive Distribution Rights and the limited partner interests represented thereby have been duly authorized and validly issued in accordance with the Partnership Agreement and are fully paid (to the extent required under the Partnership Agreement) and nonassessable (except as such nonassessability may be affected by matters described in Section 17-607 of the Delaware Revised Uniform Limited Partnership Act (the “ Delaware LP Act ”)).

     (b) Other than the Crosstex Energy GP, LLC Long-Term Incentive Plan, Crosstex has no equity compensation plans that contemplate the issuance of partnership interests of Crosstex (or securities convertible into or exchangeable for partnership interests of Crosstex). No indebtedness having the right to vote (or convertible into or exchangeable for securities having the right to vote) on any matters on which Crosstex unitholders may vote are issued or outstanding. Except as set forth in the first sentence of this Section 3.02(b) or as are contained in the Partnership Agreement, there are no outstanding or authorized (i) options, warrants, preemptive rights, subscriptions, calls, or other rights, convertible or exchangeable securities, agreements, claims or commitments of any character obligating Crosstex or any of its Subsidiaries to issue, transfer or sell any partnership interests or other equity interest in, Crosstex or any of its Subsidiaries or securities convertible into or exchangeable for such partnership interests, (ii) obligations of Crosstex or any of its Subsidiaries to repurchase, redeem or otherwise acquire any partnership interests or equity interests of Crosstex or any of its Subsidiaries or any such securities or agreements listed in clause (i) of this sentence or (iii) voting trusts or similar agreements to which Crosstex or any of its Subsidiaries is a party with respect to the voting of the equity interests of Crosstex or any of its Subsidiaries.

     (c) (i) All of the issued and outstanding equity interests of each of Crosstex’s Subsidiaries (except Crosstex DC Gathering Company, J.V.) are owned, directly or indirectly, by Crosstex f