How do I get revenge on the guy who was raw dogging my ex and give me an STD?

Anonymous
Basically he was told to stay away last year because there was a kid involved, he lied and didn't. I've already put my cheating lying ex in her place but I now want to get retribution on him. Ideas please.
How do I get revenge on the guy who was raw dogging my ex and give me an STD?
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