Why does this keep happening to me?

Stop being friends with that chick Emma because she mostly just wanted to piss you off. She knew you liked Collin and she still made moves on him that's just low I would slap that B**** if she was one of my friends I don't care. Don't stress yourself out because of this you deserve better friends who understand your feelings and don't play with your feelings. Plus, you should go find a better guy, you deserve one who will only like you, have his eyes and his heart on you only. Good luck girl!