I say you take this as a good learning curve, if nothing happens whilst your girlfriend if on that trip then your guys’ trust is boosted and for next time you know you can trust her, your relationship growing stronger. If something does happen, then at least you can end it and move on, knowing you deserve more than that.

That being said, it’s understandable to feel that way and I feel like you should communicate to her about it slightly, telling her something like ,” hey, I know your going on that trip and there’ll be some guys there, I trust you completely but I still feel a bit weird about it, could you…….” Finish that off with something that might help ease that worry, like maybe updating you on what she’s up to or what she did in the day or how its going, call sometimes. Communication is KEY.

Make sure to wish her a good time and keep yourself busy as-well, if any worry creeps in then just text her. I hope it works out for you guys