I'm a guy and really liked this girl, although after some complications she started to ignore me and basically become a bitch. So I'm at a party and see her flirting with lots of guys, which made me feel kinda shitty, so I thought I'd go for an 'easy pull' so I wouldn't consistently think of the girl I really liked. However, the 'easy pull' girl turned out to be a crush of a good friend of mine, who got pretty emotional at the party when he heard and is now very pissed at me. What should I do?

P.S. The 'easy pull' was easy for me as I got told by a few of her friends that she found me very attractive