Ahh... fallen for my best friend.. help!?

ahh.. im always in some sort of relationship problem, heart break or just straight up depressing sucky situation. but ive been best friends with him for a while now.. we go2 college together which is ending in 2weeks :/.. but we have this AMAZING connection.. a chemistry beyond words.. i was with another guy wen i first met him.. the other guy is a JERK and a loser haha we are all done and now all my feelings for him came back.. the thing is.. he has a girlfriend.. we hookedup this past week. he says he cares for me SO MUCH. and likes me alot. and our friendship is so imporant 2 him but right now he just needs 2 work on his relatonship with his girlfriend.. and he says he doesnt know what the future holds.. :/ i just know i NEVER felt this way in my whole life.. when im not with him . its the the same.. with him im so happy, calm and comfortable.. this whole thing just makes me sooo depressed :/ wahhh advise any words. be nice!