At what point would you say to yourself "enough is enough" and leave?
Some examples:
Wife had broken leg (on the mend but still most of leg in plaster) and a sickness bug plus a screaming 9 month old baby. Husband refuses to help wife walk baby up and down as he feels 'a bit queasy'. Goes up to bed and leaves wife to try and walk child up and down the living room with a broken leg while vomiting into a bucket every 10 mins. Doesn't reappear till morning 
Wife upset after brother in law died and husband shouted at her to stop feeling sorry for herself. Offered no sympathy and was just nasty about it.
Leaving him has been mentioned once or twice but he made it very clear that because he controls all their money, he would royally screw her over. She has no access to the online bank accounts as he refuses to give password.
Wife had I jury requiring stitches which meant she needed to sit in a funny way. Every time he walked past he claimed her leg was in the way and shouted at her and told her she didn't need to rest her stitches like that.
He cannot see he has done anything wrong and feels very hard done by in life. Wife took dd shopping today and he rung up at 3pm (they went at 9) asking where they were as he wanted lunch. 
I feel stupidly emotional writing this. Not to mention pretty angry!