She's asked me to come with her when she breaks up with him. Part of it is because she knows I'll always support her 100% in her decision, and partly because of my not insignificant size. I don't anticipate that he'll give us any trouble, physically, but it's best to be on the safe side. He's not usually a violent person, but one of the reasons that she's leaving him is because his drinking has gotten excessive. He used to be only an occasional social drinker, but he's gotten to the point where he's extremely drunk every weekend.
She's leaving him next Friday, so I'll let you all know what happens with it then.