Then get rid of your friend. That is a pretty shitty thing to do to you. Why keep the people who don't care around? The girl doesn't care, your buddy doesn't care, I say cut them both off. Wait for them to come and apologize to you if they really care, and if they don't, you know who your true friends are. Ignore the, don't talk to them, and if they ask what's wrong, tell them to fuck off, Simple.

Friends come and friends go and yes, it suckcs when you find out you can't trust them, but that's how you weed out the good from the bad.

Good luck.