When I was around your age, I moved away from my girlfriend and we tried to have a long distance relationship. It didn't really work; we didn't see each other enough, we didn't know each others friends, and our lives were just very different from each other.
After we broke up, we kept in touch with a phone call or two every year. Our lives both took different directions after high school.
Several years later, we ended up in the same state, and eventually ended up back together.
So, it can happen.
In the meanwhile, it's ok to move on.