IDK... For me T is not my fried, nor is he my mother/father, my lover, my doctor, my enemy...
He is my T. I had to come up with a new relationship category for him and it has new rules too. Sometimes I like him, sometimes I hate him but I still keep coming back cause I'm not finished yet. When I will be, I will stop seeing him and it won't break my heart.
I think it hurts you soo bad because you haven't completed you therapy. Honestly I don't think Ts should transfer their clients after working with them for two plus years just for the reason you've mentioned.
It is just too hurtfull for the client.

Take good care- some ADs really can mess with your head and they don't work for everybody. So just please be careful and talk to your pdoc about it.