I agree also. The more you know about your T, the more you want to take care of her/him. That's not why you went to therapy. You went to solve your own troubles. Trying to get to know things about your T and also taking care of them is a way of avoiding what you need to do. Boundaries are there for a reason.

Now that it has happened, it's a very difficult situation. If you are going to leave her then don't leave without telling her why. She deserves to know.