I'm glad that you are going to talk to a therapist. Maybe she will have some ideas to help you in addition to one-on-one therapy.
Your situation sounds emotionally draining and exhausting.
You don't sound at all as if you're trying to make the situation all about you. You just sound as though you're dealing with your part of the situation, and it's difficult.
Living with someone who has had a trauma in their life and is struggling to deal with it is tough. There are self-help books and support groups for the person who has experienced the trauma, but I would imagine that you feel like you're sort of on your own in dealing with your feelings and with your boyfriend's needs.
I found this link to an essay written by the boyfriend of a woman who had experienced childhood sexual abuse:
Living with a victim of childhood sexual abuse I read it, and I thought some of the things he said might be helpful to you. I hope you don't mind that I included it.
These forums are a good place to talk about your feelings and to see how other people are attempting to deal with their problems. I hope you'll find them helpful.