Discaimer: I am not an attorney at law. I am aware that state have laws that require treatment plan maintanence. I am not aware of any Texas state law that regulates how termination of relationship. My guess it is still left to personal ethics.

From the psycho-therapeutic perspective, it sounds like you know what would have been useful for you. But because you where unaware of the therapist's thought process, you could not have communicated how you would have liked to have been transitioned.

In my practice's policies and procedures, I have treatment plan reviews (regardless if you are insurance or private pay). My advice is to ask about policies before entering into your next therapeutic venture. This is to include what are the criteria for termination and the specific process(es).