Im in love with my best friend, what should i do?

i love him. i love him straightforwardly, without complexity, without knowing where or how. i just love him. i've always loved him (we met when we were five). he's been my best friend since kindergarden and almost thirteen years and countless memories later, he's still my best friend and i his. i realized just how much i in fact loved him nine months ago. i have tried, truly, to stop loving him. i cant. he owns me. his happiness is worth to me more than my own which is why i am miserable in my knowledge and he remains blissfully ignorant. nine months ago, i asked him if we should move our relationship further and he told me that it would complicate things too much. so what about now? next fall, we both leave for different colleges (they're within an hour of each other), but what then? after we graduate high school, should i reveal my hidden pains and longings to him?