(((((JJ43)))))

It really sounds like you were thrown for a loop and caught very off guard by his break up, because it came out of nowhere. I'm terribly sorry this is something you have to go through. I like what Skeezyks said. That you cannot control what he does, you can only control what you do. Are you in therapy? It makes sense to me that you are feeling awful right now (angry, hurt, embarrassed, humiliated). If you don't mind some advice: maybe let yourself feel awful right now. You are in the very beginning stages of a breakup. And also take care of yourself. Do some things you feel you may enjoy. I would also like to caution you about trying to "get back at him," or "Getting revenge," as I personally have always found this to be immature and not doing much good for anyone. I found myself thinking that the thing with his "friend," is pretty much speculation on your part. It sounds like you do not know anything about this person at all, and it was not talked about, and I'd like to offer a second perspective: in your pain, you are making up a story about what you don't know. I also don't know and could be wrong. But just a thought.

Take care of yourself during this time, JJ43. Best wishes to you.