Boyfriend and you going to diffrent high schools?

i really need help i really like this guy and were in diffrent elementry schools n i started dating him 3 weeks ago i love him so much n i found out that he is going to a diffrent highschool n i cant stand to not be with him and i think about him all the time n miss him so much all the time i tought we were going to the same but then i fond out he is going to a diffent 1 n i am so depressed what do i do??