He gets mad.

I had one sexual experience before my current boyfriend (C). It was one time it didn't even last long and I regret it with all my heart. About a year later I met my wonderful boyfriend C and it was about a year and a half before we started to date and have sex. He found out that I had sex that one other time before and now when he wants to be mad at me he brings that up and is pissed because I had sex with the other guy before I even knew C. So I get really upset because he always brings it up but I told him I wasn't a virgin but he won't say anything about if he was a virgin before me. By the way I was 16 when I got with C he was just turned 18. I'm 17 now and he's just turned 20. Other than this problem our relationship is amazing. Besides that he alway I mean always wants sex like everyday multiple times a day. But we live with his parents so it's hard to do and I don't like having sex that much. I just don't know what to do when he brings it up. Help please