I just got around to this thread now and have been reading posts. I just wanted to add that Ts looking up clients is a whole other story than clients looking up their Ts. Ts are bound by ethical codes, unlike their clients. Unless looking up a client is part of some treatment plan (and much preferably with the client's consent first), a therapist should not look up a client. Yes, it's human nature to be curious, but professionals in helping professions are not supposed to satisfy their curiosity or act on their impulses with clients or patients.

This sounds like it was probably an accident, if not a brief lapse in judgment. Perhaps you and your T have some mutual friends and you were suggested as a friend to her and she might have clicked "Add friend" by mistake. There are many things which could have happened, really. I'm sorry you were added and then deleted. It's understandable you're upset. I hope the two of you can figure it out so it won't affect your therapy.