What would you do?

I'm just writing this to ask advice.

What would you do if you liked this one boy a lot (and i mean A LOT) and one of your friends offered to tell him and you accepted for some strange reason?

And after that, what would you do if that same friend was throwing herself at him for an entire day and he wasn't rejecting her despite the fact that she has a boyfriend and he knows you like him a lot (or at least...you think he knows that you like him)?

What would you do if it nearly broke your heart to see that?