Friend is in an abusive relationship and having his child(kind of long)

I have a close friend who is in an emotionally, mentally and verbally abusive relationship with her boyfriend of almost two years and is now about three months pregnant with his baby. My fiance and I go over to their house and hangout from time to time because we were both friends with them before we started noticing it. She's not in denial and fully aware of what's happening I've even had a conversation with her about it but she continues to make excuses for him. I've been in the same boat as her once before and I can see the beginnings of physical abuse. On multiple occasions where I spend the night he storms at of the house screaming at her threatening to leave her saying he'll take everything. However she pays for the apartment, food and the other bills. To be honest I think he's either in denial or too stupid to realize the situation he would be in if she left. He doesn't even have a job much less motivation to get up and get his own water. But he has all the control in the relationship because of how he treats her. He's aware of her anxiety and depression issues and uses it to his advantage. My fiance and I would really appreciate your advice. It was one thing for me to get out of a situation like that myself but to be honest even I'm a little scared of him. He treats me different when my fiance is at work and I'm at their place with her and him. I no longer stay there by myself and only go there when my fiance is around. I'd really like to help her. She feels in debited to him but I don't think she realizes that she has so much more control than she is lead to believe.