Well without legit proof, I would not use it as a reason to leave her, it could be false and then you may feel worse.

that being said..... I get this in a somewhat way. I too often feel like running away, but not for the same reason, mine is out of fear of getting to close... because it will leave me hurt in the end and feeling rejected etc... things I can't deal with

It's hard though because my attachment sucks me back in week after week, so even when I'm exhausted or sick of therapy and want to quit, the idea of him leaving my life on MY terms... well it's something i can't live with

I am sorry this is so tough for you, attachment and all the stuff that goes with it is scary and stressful. If your T is being that unethical, it also sucks and I am sorry you had to find out