How to be less sensitive.

My husband intentionally tries to hurt me when we have arguments. He knows I was severely abused almost my entire life and when we argue he says cruel things to me to hurt me and admits that he knows he's hurting me but doesn't care. I told him I'm a simple woman and all I want is an apology. That's all I ever want. He says he's not going to apologize to me for what he said because his intention behind what he said was to hurt me and he's not sorry that he did it. In fact he has even admitted that when we argue or I don't do what he wants me to do that he says things to hurt me because it's the only way I hear him. He blames my sensitivity. He said he's tired of apologizing for hurting my feelings. I told him when he says things to hurt me if makes me question my worth and all that I do is to make sure he knows his own worth, to honor him, to love him.   No matter what I say he doesn't say sorry. I don't understand. He told me my big, kind heart was what he loved  about me...then why doesn't he cherish it? I don't know why in writing this. I don't know why I expect to get from it. But all I know is I feel like my insides are crumbling. I looked at the mirror and begged myself to turn off the part that gets hurt. But it won't turn off. Is this my fault? I was abused from 6 years old on into adulthood...the faces of my abuser changed but I was always in this same spot. I can't stop it. I want to delet whatever part of me that makes it so that the people I give my heart to will stop hurting me. Help.