How do you take revenge on guy who cheated you?

First of all your bf cheated on you the girl did not cheat on you so the perosn that you need to be mad at is you BOYFRIEND. Forget revenge, say good bye to the guy that is creating drama for you and get on with your life. If you continue to hang out with a looser your will never find the right guy who could be the next guy.

You can be mad at the girl too; she is obviously not your friend and did not care how you were affected. Best bet is to let 'what comes around, goes around' be your course of action; do nothing now but never forget who she is and maybe you can witness (or even help along) a problem she has in the future. Sometimes what may seem petty is just what we need to feel better, and get even! This might be how you get on with your life. Get it out of your system!