Long time, no see

I am 15 with a 17 year old boyfriend. We talk (via text) almost constantly and see each other almost every day, but soon (due to vacations and marching band) we arent going to see each other and will have limited talking for almost 4 months! We only realized today and this starts in a week! Any tips on how to get through these four months? Or worse, what to do when he goes to collage?