What to do when you miss someone so much it hurts?

ive known this guy for a few years, and he for sure likes me, and ive never really known how much i like him til this year. i got to know him pretty well and i fell in love with him. heres the strange part.. somehow, idk how, but i can tell how hes feeling, and ive never ever been able to do that with any other guy i really liked. btw he can also sometimes tell how i feel too, which is even weirder lol.. anyways on the last day of school i was really sad and he could definetly tell, and he tried cheering me up but it just made me think about how much ill miss him. and i have been very busy this summer, but i still miss him so much.. so much that it hurts, and that i need to see him. right now. im not able to contact him though, so idk what to do..