Relationship problems - Living in the Past

Me and my man have been together for 8 years. We have been on an off every summer for the last 4 years out of the 8. Thought we was doing great. But when we get into an argument he brings up my past. He has me tell him every little detail as to what I have done and haven't done, when we aren't together. But he feels that he shouldn't have to say anything about what he has or hasn't done. Is it right? Why do I feel like a bad person? How do I get past this? I cant even mention people's names without him blowing up.