My boyfriend is the only person I have ever been with, kissed, had sex with and been on a date with. I rejected other guys before him. He has slept with 15 people and has had a threesome and been at an orgy. I know the details of his experiences and they really get to me, making me angry and upset often as I cannot stop thinking about it. Should I leave him and find someone else? We sort of plan on being together for the rest of our lives but I cannot come to terms with what he has experienced and what I have missed out on.