I'm going to expose my cheating girlfriend and tell the other guy she cheated on him.
Why do you want to expose her.
I hate her now and I just want her to pay for what she did to me.
I am sorry she cheated on you.  It is bad to cheat on your boyfriend.
Me and the other guy are going to expose the bitch.
That's a good idea to warn other people about her. Cheating isn't right.