your title question has any of us had therapists who changed their mind to terminate... with me no. once termination is decided thats that.

Treatment providers in the USA do not have to even give one final session or advance notice. some do some dont, its a personal choice in their jobs.

that said I took the time to look back at your posts concerning this therapist and what happened and so forth.

your posts you were not happy with this therapist. you were upset that a therapy session break had happened ie therapist vacation time. you discussed with your therapist how you felt about their taking this time off, and how you are aware that you push and pull and cancel the next appointment when they get back. then after you cancel that appointment you end up crawling back to them (crawling back is your words)

the therapist felt this was attention seeknig behavior and was no longer going to put
up with it. they followed through with when you cancelled the session as you told them you would, by filling that time slot with another client.

you were not happy that they filled your cancelled by you time slot and that they called you out on this behavior and followed through with what they said they would do.

you emailed them blaming the therapist for upsetting you. since you were not happy with them for calling you out for what they felt was attention seeking (purposely canceling the first session after the therapist gets back from vacations or time off their job) they decided to end therapy with you.

I honestly believe that when this therapist says they are giving you "one last good bye session" that they mean it.

I believe that this is it, that they are no longer going to put up with your cancelling appointments then wanting your cancelled appointments back just because you are upset that they took their vacation time, or needed time off in their jobs. no amount of your habit of "crawling back" is going to happen any more..

when you see this therapist for the good bye session you and the therapist may talk about other therapists and agencies. and helping you get set up with the new therapist and agency if thats what you want to do.