Unrequited Love is something that needs to be mourned over (like death) and then move on with your life. Life does go on, even after death.
Life, after a situation like the one you have described, will go on, but you are the mover and the shaker of that life. If you continue with this sort of "friendship" in which you feel one way and he feels another, you'll be miserable for the rest of your life.
Say, Farewell to this fellow even friendship wise, because you deserve better and you know it. Mourn the situation as much as you need to, but treat it as if it were a death, which is what it is.
