What should you do if your in love with a boy that is not in love with you?

Realize that you're probably not in love with him. No matter how hot he is, or how compatible you might think you and he are, truth is, you're not. Same thing can be applied for both genders, and all sexual preferences. If you two were meant to be, it would have happened. Simple as.

Second Contribution: Good advice above! You are probably just infatuated with him, which happens to people all the time. I don't think you're IN love, you just think you love him. Only time will tell on this one.