What to do about being in love with someone that does not love you back?

I have a friend that i'm in love with, he is a guy, i'm a guy, that would make me gay, he of course is straight. he is married, we have messed around back when we were younger, just said it was because of that only. he is now married, and i still have fantacies alll these years later about how i am going to at least look at him nude, mess around is on a whole other level. someone please tell me what to do. he is not responsive to anything i do. in fact he knows if i am trying to look at him or jack off around him maybe while he is sleeping, he says no to ANY thing that is sexual