My ex.... and now they're broke up..

Baby

So I use to date this guy (it's been about 3 yrs ago) he got together with this girl and almost everytime they get into a fight he calls me to vent witch I dont mind. Well this last time she decided lie about stuff to put a restraining order on him so he had to move out since then I've been spending a lot of time with him. I've always had feelings for him but this time they are getting stronger and I know he's not over her. They talk constantly and it's not just about the baby. But by the end of every conversation he is crying and very upset about the way she is towards him. I try to comfort him and tell him what I think he wants to hear. But what I really want to say is LEAVE HER. She is abusive to him and puts him down constantly. What do you think I should do????