Teaching a lesson/revenge

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Dear Mr. 4chan

I come to you seeking inspiration and/or assistance.

Here's the story:
Talk to this guy 3 years ago. Becomes an aquintance of mine and my ex (I was first). Gradually friends up with her. Info: open relationship. They hang out, text and shit. She assures me they won't fuck. Fast

forward some weeks: I find out they fucked. Since they're friends, she invites him to her bday party. He doesn't know that I know they fucked. I ask him if there was anything going on. He negates.
I tell him I know and that I have a problem with him. He claims to not understand why.

Some months ago, same cocksucker messages my new gf. Open relationship again. He either doesn't know she's my gf or he's doing it on purpose. I inform him and make it clear he should stay away. He

understands, telling her I've marked my territory.
Last week, he messages her again on another website, asking for a meeting (to fuck). She tells him she has to ask me first and then tells him I have a problem with him. He responds saying he doesn't know why

I have a problem with him.

End of story.
Since she already answered, I couldn't troll him or do anything. But! I do have his facebook name (real name) and his profile on two other websites + his personal photography page.
Can you do something to fuck up his shit, Mr. 4chan?
I don't want to arrange a meeting between him and a baseball bat for example, because then he'd probably sue and ultimately win. So I want to have something happening that doesn't lead back to me.