This. 100% your relationship and it's boundaries is up to you and your girlfriend not your friends.

I always run into this kind of story. Every girl I have been with has had a dude that has tried to control or her or has shown jealousy issues. Let it go, man. You can't control her. She has her morals and values and she knows what she is doing. At this time, if you have shown her that you are the man she wants to be with, she will be on her best behavior. I don't know how your relationship with this girl is but that's usually the case. Even the girls I don't have officially as my girlfriend has commented on how they can't have guys as friends because then they try to do make moves on her. I haven't even asked her to brush off other guys but they voluntarily tell me this.

It's up to the girl. She is a grown adult. My current romantic interest asked me if I would ever tell another man off(a man that is trying to game her). I told her that I wouldn't dream of it because I would move on to another girl and won't think twice if it caused a problem with the relationship I have with this "girl". This way, I established my boundary and it's up to her to either keep it on the DL or keep it just me.

You won't gain anything by holding the girl back but resentment. A girl doesn't like to feel like she can't-do something. Eventually, this will fester into a bigger problem and you will lose her. Let her go party. Who knows what will happen. Maybe she will do something, maybe she won't. Personally, as long as she comes back the same and gives me extra love and affection for the days she wasn't here...that's cool. If she started being distant, then I'd have an issue.

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Seems like you listen to others more than you do to yourself.

Practice what you preach. Reap what you sow.

Her freedom is not your's to give or take.

You need to let her go, you cannot stop her. Don't be needy, that will only make things worse. Remember, a woman will not have intentions of sleeping around. You piss her off, she will be taking the entire football team and thinking about you telling her not to go.

Remember as she leaves, you need to be more confident than any guy who will try hitting on her. Don't text her, don't call. If she calls/texts you from a party its a good sign. If she asks why you never contacted her, let her know you wanted her to have some fun.

EDIT: look at it this way, man. If you fall in love and marry her and sail off into the sunset with a hot trophy wife, nobody will know she had a fling at a college party. You still have a hot trophy wife.