I applaud you and your efforts. Going through withdrawal is painful. One thing I've done to help me with relationships that I was addicted to was to write out on a piece of paper what the "payoffs" are of being in the relationship. To spell out what I experience when I'm with this person or this person is in my life and what the payoff is. What are they filling? From what I have read so far this woman is probably the only living soul that you have "let in" to an area of your heart that was deeply wounded, perhaps from the csa. This is a young part of you, that was very lonely and in need for someone to care and protect you. I'm only guessing that you didn't let anyone near that, not even your husband or closest friends. But you let this women get in there and this wounded part started to "hope" and have all those wondeful feelings of love. (Love isn't just sexual) warm, fuzzies, and needy. This is not pathetic. This is part of being human.
So I'm going to guess that this ex therapist on one level knows exactly what she is doing, and you are providing a "fix" for her; some need she has for you to be emotionally dependant on her. I don't mean to sound so "hocus pocus" but manipulation is sometimes like a wicked form of witchcraft. (not the nice kind. I don't mean to offend any witches here!) That's why it's so hard, and why your current therapist expresses anger about it.
The next thing I did was write out what is the pain I feel when I am not getting my "fix" For example the pain of withdrawal is because the "fantasy" is dying. things like that. Naming those things myself and putting it on paper helped some. Then there is grief because the ex-t is not what you, or your young you, had hoped and believed. It hurts like a mother f*cker. I am not kidding, it hurts like hell. But the truth from what I reading is that the relationship is not life giving, but life sucking. She is effecting that wounded part, and activating it. She is not healing it. Only activating it, and that keeps you in this toxic relationship.
Keep going. It really is amazing that you were ABLE TO SAY NO when she asked to spend time with you! It sounds like you are growing and that is awesome. A good friend of mine is doing a Boundaries online class and getting a lot out of it. I think the guy's name is "Cloud" and my friend pays a small fee to take the class online and sometimes has to go back and redo the exercises. That may be helpful to you. It has been for my friend.
Best Wishes in this ever so painful journey. It's worth it.