A local attorney is a wise choice ... since you did live together, filed joint returns AND the jail recognizes you as the spouse you are probably common law wed especially if you have joint bank accounts, Credit cards, mortgage or rental lease among other things in common.
https://guides.sll.texas.gov/common-law-marriage
https://www.texasbar.com/AM/Template.cfm?Section=articles&Template=/CM/HTMLDisplay.cfm&ContentID=469...
https://www.unmarried.org/common-law-marriage-fact-sheet/
If you live in a State that Does Recognize Common Law Marriage
If you live in one of the above states and you “hold yourself out to be married” (by telling the community you are married, calling each other husband and wife, using the same last name, filing joint income tax returns, etc.), you can have a common law marriage (for more information on the specific requirements of each state, see Legal Information and Resources by State). Common law marriage makes you a legally married couple in every way, even though you never obtained a marriage license. If you choose to end your relationship, you must get a divorce, even though you never had a wedding. Legally, common law married couples must play by all the same rules as “regular” married couples. If you live in one of the common law states and don’t want your relationship to become a common law marriage, you must be clear that it is your intention not to marry. The attorneys who wrote Living Together (additional information below) recommend an agreement in writing that both partners sign and date: “Jane Smith and John Doe agree as follows: That they’ve been and plan to continue living together as two free, independent beings and that neither has ever intended to enter into any form of marriage, common law or otherwise.”
