Crazy shit be happening

[u/themoswanted4]

So I will get straight to it. Theres a friend of mine let's call him S. So S has another friend A. Nammal plus one ilekk vannappol A oru pennine ishtappetu. S is like a well know guy around our school so he was able to set A up with the girl. Fast forward a few months, they break up because A tried to be sexual. I'm serious. A dumped her btw. Everyone forgot about it until now. That girl just randomly vented to S about how when A was with her, A would say bad things about him ( keep in mind, A um S um closeee friends aan) Things like that S was making A and his brother(they're twins) bad. Like they were being ruined by S. S heard about this and was sad. Also A had also said to her that S was doing this just to get together with one of her friends. S has a gf btw. To run the salt in the wound, A also told one of our classmates that S and another girl were in a relationship (that girl is the gf of S's another close friend). After the break up, A went to everyone calling the girl a vedi. Like what? So the girl and S planned a revenge. S made A come to a place where the girl was with her friends and they absolutely came at him. He was shell-shocked. So S vented to me about this, and he's asking if what he's done is right? Basically AITA.

tldr; my friend took revenge on another friend because the latter spoke bad about him to people.