My senior daughter recently broke up with her HS junior boyfriend. They'd been dating for over 2 years, but he really didn't want her to go out of state for college. The more nervous he got about her going away, the more clingy he got, and the more turned off she became.
Sciencewoman Jr., here! My boyfriend and I were determined to stay together through college, but in the end, it just didn't work out. The more I thought about it and we discussed it, the more I realized it just wasn't going to be a manageable situation. You and your boyfriend might be in a different position, but for us, it wasn't in the cards. The one thing we did discuss that I think might be useful to you is having a schedule for communicating (calling, skyping, etc.) and for visits, which might be easier for you than they would have been for us. Hope this helps!