My boyfriend is 22 and told me he's been with 14 different girls already. I've only been with 5 and they where relationships, his wasn't. I guess because I'm older that stuff doesn't bother me anymore. There is NOTHiNG you can do about it and it was before you came into the picture. Everyone has a past of their own. Good or bad just love the person your with and stop thinking so damn much...lol