What To Do About Her.

fight for her, dont let it go without even trying, but be careful as you do this, you dont want to ruin your friendship, but dont let it go, fight for her!

slap her round the face then get her really drunk.

I could only imagine how crushed you feel that she likes someone else.

But you have to see past your own relationship with her and look at it more plainly. If she's willing to "pass you up" for just some other guy when you're 1) very close, 2) when you're attracted to her more than she is to you then you absolutely deserve better than her, and as hard as it may be, if I were you I'd just try and move on and leave her in the past.