My ex-girlfriend what should i do?

First of all, did she tell you about this or somebody else told you about her giving subliminal message to your friend? Well, either way shes crazy, desperate, down right annoying & stupid enough to think that she can get away with this despite knowing that you're his buddy. Bros before hos dude!! You know what to do before its too late. If you dont help out your buddy, soon enough this girl will be in your life at all the wrong time - psycho.