A close mate was battered by his missus anytime she got drunk, he put up with it for nearly 20 years! eventually, as his daughter was old enough to move out, he just packed his bags, dumped them at his brother's and went to the pub and never went home.
Oddly, it made him ultra aggressive after a beer or two, but not so much now she's almost out of his system. My sadness is that she took his best years and his confidence and self esteem. Not sure he'll let himself get into anything meaningful again, which I see leaving him feeling quite shallow.
She broke his nose, chipped teeth, bruised ribs, and when he eventually stopped looking hurt, she used weapons to hit him. Very bizarrely, he got into a fight in the boozer with a bigger (fat) bloke, and a few weeks later, in another pub, his (ex) wife walked in and started kicking the crap out of the bigger bloke! Even though they'd been split for many years. She was tiny too. Little skinny ratty thing.