My ex has started to chat online to a good friend of mine, the friend who actually introduced us. Thing is he was very abusive but I have never told anyone in RL apart from DH and his family (who called me a lier). So obviously my friend doesn't know, but he is planning to go and 'visit' her and I don't know whether I should butt out or say something to him or her. She is pretty vunerable, he has taken advantage in the past with her (she didn't see it that way because she isn't pretty niave) and I know he is going up there because he thinks she is easy 'prey'. I really don't know what to do...