Here to help! :) and I'm glad.
Yes, even today I think there's still quite a strong taboo re divorce. Maybe it depends how old you are; I'm in my 60s so all those stories blaming society's ills on 'children from broken homes' that used to be standard newspaper fare have probably had their effect. Oh no, am I going to 'break' my child's home, what sort of monster am I? I must strive to be stronger.
Not been through divorce myself, and my parents didn't divorce either, but the environment that existed in our 'unbroken' home was one that I ran away from as soon as I was able, same as my 3 older brothers. Larkin would've had a field day in our house: he'd have pointed to my parents as they drank, smoked and argued themselves to death, and said, "See?"
Partner's parents divorced, and by all accounts not a moment too soon. If homes are broken, the breaking takes place well before the legal mechanisms start turning. Don't blame yourself. A 'good' wife and mother is no longer one who absorbs all the work/criticism/sadness for everyone in a home. And sacrificing yourself won't work even if you could manage it. You can't isolate children from what's going on, they have eyes, ears and brains.
Other posters on this thread know more about the violence angle than me, and what steps to take to protect yourself. Before hearing about his attack on you, I was thinking, maybe he can change. People do, and relationships are often the means by which they change; we don't enter them fully equipped for everything that's going to happen - certainly true for me! But violence changes the playing field so much, it has to, because of the possibility of further violence. I can only wish you all the strength you need to get through this, and move yourself to a better place to bring up your daughter.