[DubaiSis]

It's good that you're being realistic, but maybe a smidge more than fatalistic. I don't think it's healthy to go into college with promise rings and statements of undying love, but you don't have to completely nip it either.

I don't think there's a lot to be gained by beating it to death with each other. If you get to this summer program and immediately find yourself attracted to lots of girls, then I think your answer is stating itself. If you like the feeling of being grown up and on your own, but really wish she was there with you, that's probably a pretty healthy way to feel, and if you are sitting in a dark corner nursing a beer or vomiting your whole relationship woes with any girls who will listen, then you've got some other issues to deal with. But here are some things to be aware of:
1-no matter what, at some point you will get lonely, call her and want to get back together.
2-at some point you will probably do something really stupid where it applies to girls and/or alcohol. Do your best to limit your exposure in both cases. You're smart enough to know how to take precautions on both points.
3-the next few years are more stressful than you can ever imagine. Try to not be too hard on yourself.