I like her but my "friend" liked her first? HELP?

[Smarty Pants]

When I first read your question (the one in black) my first thought was Bros before... and you know the rest but when I read your description I was totally wrong. You have every right to like Amy back for the following reasons:

1) Your friend is in love with his EX and that means he he should focus on his EX
2) He does not even like her and just wanted to get into her pants
3) SHE FLIRTED WITH YOU FIRST!!! Which means you were being a good friend and didn't seek her, she sought out you
4) He totally played you and made you almost lose this girl

So I would say to go add her on Facebook and your friend was being an absolute jerk and that you deserve that girl, he doesn't. Plus you should explain everything to her! Go for it dude because you never know what could happen.

I hoped I helped and God bless