I feel bad for that other guy. Really bad.

Doing your best (even if seeking a bit of validation) for a girl you love and seeing her flutter away for some guy who doesn't care about anyone's feelings and cheats and whatever (and that, however fun, nice or cool he might be) really is hard on the nerves and the heart.

But whatever. You didn't choose, and neither did he.

I know it doesn't answer your problem, but I had to tell you that.