I scared I'm going to ruin this relationship

I have been dating this guy for 6 months and it freaks me out. I was in an extremely abusive relationship with this guy for 8 years. I was 14, he was 20. I know it was gross. He was super manipulative and when I turned 16 he convinced me to run away to be with him, so I did. He beat the shit out of me everyday and I wasn't ever allowed to leave. I couldn't even see my mom. I got pregnant and wanted to keep the baby but he got mad at me for getting pregnant and beat me until I lost it. Sex was not always consensual. No was not an option. I was in a domestic violence shelter when I finally decided to leave. After 3 years of therapy I met my now boyfriend and I'm scared I'm going to ruin it because how he treats me freaks me out because of how I was treated for so many years. I wore something a little revealing and he said I looked good. He didn't tell me to change or I couldn't wear it. My brain automatically turned to he doesn't care about me because he doesn't care what I'm wearing. I talked to my friend about it and she knows about my past and she called me stupid and made me feel bad. I understand him not caring what I wear is a good thing. He treats me so well and when I tell him I don't feel like sex he just says okay. These are good things! Why do they freak me out so much? How can I keep my feelings from ruining my relationship?!