How to get revenge on the slut that my bf had sex with?

My bf and I've been dating since September 2014. I found out he cheated on me last weekend with this slut in his chemistry class. I'm over being upset. I Talked it out with my bf and I am trying to forgive him since he was drunk and she wanted my boyfriend since the beginning of the school year and I've heard that she had the hots for him.
How to get revenge on the slut that my bf had sex with?
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