GF going on vacation. Really scared...

[TravelingMan]

Dude, i think it's probably best you don't think about it and just let it be.

You are trying to control a situation that is uncontrollable. Are you going to try and "steer" her a different way? Maybe that'll work this one time, but if she has plans to cheat on you, one day she will!

But, as of now, you have no proof she will. So my advise is just let it be, be the better man and trust her, and if she does, leave. But at least you're leaving/breaking up for a TANGIBLE reason, and not just speculation.

[Doc Durian]

or break up with her and explain that it's because distance doesn't make the heart grow fonder and holidays can be wild, you'd rather not be together instead of dwelling on it every minute of that week.

Tell her, "so we're single now. Who knows what the future brings."

Then mention that you're going on a vacation of your own while she's away

(pick a destination full of hot half naked chicks and alcohol)