What is the worst thing you’ve done out of revenge?

The worst thing I did was when my ex boyfriend and I broke up, he started seeing another girl and one night while he was drunk she messaged me from his phone bragging to me how she had him now. The next day I called him and asked him to come over, I slept with him and got him to spend a few nights at my place and convinced him to break up with her. When he was asleep I messaged her from his phone and told her that he’s been at my house and we’d been sleeping together for the last few days and that I’m the one who told him to break it off.

Not my proudest moment but at the time it made me feel better.
What is the worst thing you’ve done out of revenge?
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