My boyfriend won't let me tell him about my past.

I have been dating a guy for over a year, we spend 3-4 days/nights together every week and we are very close in most areas. He knows that I have an abusive past (abusive ex-boyfriend, was also raped) but he won't let me talk about it. I have bad dreams sometimes and he wakes me up from them but if I try to talk about them he shuts me up and says he does not want to hear about anything that happened before we were dating. Though that is not true because he is interested in other ex boyfriends and such, but won't talk to me at all about the trauma in my past. I have always wanted a partner I could share this with, someone who would still love me despite those things but he just won't let me. Why is he not interested in this part of me? It make me feel like that part of my past disgusts him or something and I don't understand why?
My boyfriend won't let me tell him about my past.
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