The love of my life asked my best friend out. What do I do?

There's nothing you can do. Obviously that pesron doesn't feel the same way about you.

We'll need more details if you want more help.

How does your best friend feel about her? How long have your liked her for?

Awh that sucks dude.
Um, well if your best friend said yes then he's obv. Not a good friend.. unless you haven't told him that's the love of your life.
If he doesn't maybe trying talking to him so he can talk to her.
But even better, you should try talking to her.. & let her how you feel.
Its always nice to hear how a guy is trully feeling...
Let me knoww how things go:)
-Fahtee

Get new friends. And a new love.