I would find another therapist and discuss this particular problem.

I don't know how your boyfriend could be that insensitive that you weren't interested in sex at that time but I would not want to be around him at the moment, that being the case. Maybe go see a therapist together since you obviously have issues he's not aware of or able to perceive correctly?

Everyone dissociates to a certain degree, you are just a more extreme degree during events similar to those you experiences before with the first rape. It's not "bad" or wrong or anything, it's your mind and body protecting themselves the best they can. Find another therapist who will work with you!