I'm going to drunk text my ex about how I knew that they were cheating on me
Wait, if you knew that your ex-was cheating on you why did you continue the relationship for so long?
I heard from a friend of mine that he broke it off with that girl and I really liked him.
Being upset with him is fine but he's your ex for a reason. Texting him while you're drunk might end up making you do something you wish you hadn't. Just block the guy and move on before you end up hurting him or yourself.
Ok I'll move on.
It's probably for the best you don't need to bring up things like that from the past.