Download a cohabitation agreement template to describe how you and a nonmarried partner will divide obligations while you live together. This affidavit documents the cohabitation of two individuals for over ten years without being legally married.The Texas Department of Criminal Justice does not have a sample affidavit available online. Explore Cohabitation Agreements in Texas Family Law with Bryan Fagan, PLLC. Protect your rights and assets—get expert guidance today! An Affidavit of Cohabitation is used if a couple wants to prove that they are living together as spouses for a certain period. Once you have filled in the other sections, both parties should sign the agreement so it becomes a legally binding contract. For some couples, moving in together is the next step in a long-term relationship. For example, an agreement can specify how partners will split income and household expenses. Military. Military Affidavit.