My roommate is not helping in paying the rent at all. I want him to leave. Do I have to give him an eviction notice? We live in Texas.

Hi, first of all, who owns/asked who to move in with each other and did your roommate sign a contract, if not then no, no eviction notice is required

If your roommate has ever paid any rent at all or has established residency then yes, an eviction notice is required. You have to follow the laws for eviction in your state regardless of whether there is a written lease or a verbal agreement.