Boyfriend wasn’t a virgin but I was

My boyfriend and I have been together 8 months and have lived together for 3 (I know we went fast). He told me before we had sex that he had an ex and they had a lot of crazy sex. I’ve never done much with a guy so I was inexperienced. To this day, it bothers me so much. To know I’m not the only one he’s been in and that it’s not fair that he doesn’t get to feel that way. It honestly feels like it’s tearing us apart because I know the person I want to be with always hasn’t only been with me. Is there anyway to get over this feeling?