I was in this situation, too, Feathers, and I agree with those who answered above...take it to T and get some help with your feelings and what to do. Personally, I would mail it back to the Jerk so he will know his self-centered ploy was seen through and rejected.
it's so hard to make a thorough emotional break with someone like that, as it's hard to see them as they truly are.
It would be better if they were all evil and had beat you up so you could see for sure the bad they did. Some more time and sharing with the therapist will help with self esteem and fully understanding that you owe him/her nothing whatever. I even eventually married the man who started using me at age ten. He was good to me. I didn't see myself as a "victim" for a long time. But I didn't realize how very damaged I was until I had a breakdown. I got away from him, like you did yours, and he tried to get back with me. I'm so glad I stayed in therapy and got the reassurance and strength I needed.
I'm just saying this about myself because maybe it will help you stay with your T and keep on with the great courage you've had so far.