Honestly? I would let it go unless you want to live your entire marriage this way. You can't control what he does at work or out at any other time, too. I say this as a recovered uptight girlfriend. ;o)
When I met my husband, he was actually still sorta in another relationship and even though he broke up with her and chose me (she was in Germany and NOT coming home so this started their breakup anyway..) I was still completely obsessed with her
and any other woman he met. It drove me crazy for about two years. It took a while but I learned to relax and realize he chose ME.
Let's look at it from two perspectives:
A) he is completely devoted to you and has only real love for you. He has fun with his friends and never crosses a line that jeapordizes his commitment. You go crazy on him and don't trust him and it causes serious issues with you through
out your relationship/marriage.
B) He is a dog that will do anything he wants to anything he wants. You don't want to be in a relationship with someone like that and you don't trust him for good reason.
Which scenario does your FI fit? If it's A, then get some counseling and talk to someone - with him or without him- to get past it. I did!