Hey man,
I am in almost the exact same boat as you are. I met a girl at the start of summer out at this summer camp. We hit it off and got real close and by the end, we decided we wanted to stay committed to each other. When we both moved back home it became really tough. She lives 2.5 hours away, and neither of us have a car so visiting is difficult. She is also bad at texting/calling, but its only 2 months before we are back at school together. Another thing about her is she has never had a bf before me, so she is used to going out with friends, getting drunk and having guys hit on her and not having to hold herself back. But you and I both have no reason not to trust our gfs. This is a positive thing and we should respect their privacy or time apart just as they respect ours.
I always seem to formulate these crazy scenarios in my mind, where she is wasted at a party and some guy will come up and take advantage of her or she'll just say fuck it and go home with some guy. It is really tough man, and I feel your pain. One thing that helps is I am using this as a way to build trust with her and make the relationship stronger for when we are back together. It is tough for both of us, but if I know (or assume that I know) that she was faithful while we were apart, I feel as though there won't be any anxieties or worries once school starts. I am also proving to myself that I can hold my own values and not cheat or betray her while we are apart. So not only am I using this as a way to trust her, I am using it as a way to build trust in myself, which is always a positive thing. You have to realize that she is probably having some of the same worries you are when you go out with friends.
It also helps to keep myself busy. When I am busy thinking about something else, whether its partying with my friends, working out or reading a book, I find that it is easier to keep my mind positive about our relationship. And one more thing, do you smoke weed? I have nothing against smoking it, but I find whenever I do, I tend to get paranoid about a lot of things, including what my gf is up to. So I recommend going easy on the bong
