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Spill the beans. Sue the woman on the side. Post the news publicly. Print out proof as a present. Tell the person on the side.
One way to get back at the cheater is to tell the truth about what happened. That doesn't mean you should go into extreme detail. Rather, if one of your friends or even one of your ex-partner's family members ask, tell the truth, that your partner cheated on you with someone else. Eventually, the bad karma will get back to your partner in the form of a tongue lashing from a mutual friend. However, this revenge can backfire if the person you're talking to is fiercely loyal to the other person. They may just see it as you spreading lies around. In seven states, a married person can sue the person on the side for damages. You can try this (legal) revenge in Hawaii, Illinois, South Dakota, Utah, New Mexico, Mississippi, and North Carolina.  Generally, you need to either prove criminal conversation or alienation of affection. With criminal conversation, you'll need to prove that your spouse is having an affair generally through the use of a private investigator. With alienation of affection, you just need to prove that the person on the outside moved your marriage from a loving one to one of alienation and that you were harmed by that situation somehow.  Contact a divorce lawyer for more information. If you're sure your partner is cheating, you can post that information in a public forum. For instance, you can post it on a social media platform as a blog post or add pictures to drive home the story. Alternatively, you could go with a paper version and put up flyers in your neighborhood. That way, your spouse has to live with the consequences in a public way. This one is good to try if there's a big holiday or anniversary coming up. Instead of outing the person right away, print out any proof you have of the affair. Wrap it up in boxes to hide the fact that it's not a present, then have the person open them on the big day. If you can find a number for the person your partner is cheating with, try calling that person up. That person may have no idea that your partner is with someone else, and letting him or her know it may be pretty good revenge.