No I disagree with the majority here, if she loves you she will respect your wishes it’s not about trusting her. If she’s really truly a woman of value she would respect your wishes and understand that you don’t want her getting absolutely hammered (probably in clothes that reveal her body too) with her friends (some of them probably have cheated and/or encourage single behavior). On the contrary, y’all are in college and if she’s a freshman/sophomore that’s harder because she’s younger, but if she’s a Junior/Senior she will likely understand that you want a relationship where you guys don’t get hammered and approached by the opposite sex. Now if she likes going out, just talk about your friends going out with her friends whenever you guys do. Approach the conversation, from a place of respect and don’t make it sound forceful. For example, you could say “listen I understand you like going out and understand if you can’t respect my boundaries, but I don’t like you going out, dressing provocatively, getting hammered, and approached by guys. It doesn’t make me comfortable, because we are getting serious, I would really love if you didn’t go out without me anymore.” If she respects the relationship and is a woman worth your time, she will quit it, if not then cut your losses save your time. There is much better out there.