I've gotten involved on more than one occasion and truthfully the thing that stands out in my mind as a reason to hesitate or overlook a situation like that is one such time my brothers stepped in or attempted to. I was bartending at a friend's place and my baby brother was enjoying several malt beverages. I'd gone to the bathroom and while I was in there one othe the guys at the bar slapped his girlfriend. As I was going back behind the bar, baby bro grabbed my arm and told me I'd better be glad I was working or he'd have kicked somebody's ass. I said "Huh?" He explained what happened and how he didn't want to get me in trouble at work. I told him I was working as a favor and I oughtta smack him for waiting to tell me. He quickly jumped at the guy who ducked into the bathroom and locked himself in. Another brother came in, heard the story and decided he was going to help dispense some justice as well. While the discussion was going on the slapper eased out another door and walked around the outside of the building to where his girl awaited in his car. Five minutes later they returned to the bar arm in arm all smiles. None of us said anything because it seemed they'd worked things out. My baby brother crystalized our thoughts in one sentence "If she's that stupid, she's asking for more." I wouldn't have said it exactly that way but in truth, why get involved when they're only going to make up and make you the bad guy?

__________________
As to marriage or celibacy, let a man take which course he will. He will be sure to repent - Socrates

Love is not looking in each other's eyes, but looking together in the same direction - Antoine De Saint-Exupery