How can I stop hating my crush's girlfriend?

My crush is my best guy friend. He's hilarious, cute, sweet, and just awesome! Too bad he's dating this slu++y wh•re. He can do so much better. She cheated with my best friend's boyfriend. But I know I shouldn't hate her because she's a person too and she can be funny/ cool. We're both on the soccer team and during a game, I got shoved and landed backwards onto my wrist and broke it. I couldn't get up and she yelled: "HAZEL'S DOWN!" when no one else noticed. Then as I was helped and got off the field, the other team was laughing at me. She SCREAMED: "I DON'T CARE WHO YOU THINK YOU ARE!!! JUST SHUT UP IT'S NOT FUNNY!!!" and the school was a snooty prep school who thought they were better than us. Anyway, she's occasionally funny and she was the one who defended me. So I can't hate her for that. But she's dating my crush who can do MUCH better! How I remove the hatred? :/ I know their relationship won't last; that part makes me very happy >:) but how do I stop hating her along the way? Thanks