OP, I have read this thread and am truly touched that you have come back and are going to act to prevent your DD being abused by your partner anymore.
There are literally hundreds of threads on here where women, just like you, have found it difficult to leave a man like this, to the point of finding it almost impossible. It seems so daunting at the time, but on here, you will find the support, advice and help you need every step of the way.
I have read many threads where the OP didn't leave her partner in the end, and continued coming on here every so often to ask for help, which they got, I have never seen mn tire of anyone's plight. I have also seen many more threads where the OP did pluck up the courage to end the relationship, and without exception, not one of them regretted it to my knowledge.
My own mother stayed married to an abusive nasty man, and whenever us DC asked her to leave him, she would cite financial reasons, nowhere to go, us DC shouldn't piss him off etc etc etc.
Eventually, when I was 17 yrs old, my mother left him, but she still longed for him to change, loved him. I never understood why. To me, it was logical, How could she want to be with someone who treated her that way? I already didn't believe I was worth anymore, but I couldn't understand why my mother felt she deserved so little.
You see, there was always something wrong with me, I always got it wrong, that's why he treated me so badly. I didn't trust my own judgement, and spent many years seeking the approval of every man I fell into a relationship with, every friend I had.
I am almost 40 now, am single, and yes, I am in regular contact with my now divorced mother, who is also still single.
Do I respect her? No
Do I like her? No
I don't tell her this but I'll tell you what I think of her. I think she is a weak pathetic self absorbed misogynist, who puts men above and beyond any of her DD's. I don't like her, I don't trust her, and I don't understand her or why she stayed. In fact, if she began another relationship, guess who would be dropped like a hot potato...me. This may not be true, but that's what she taught me.
You only get one crack at parenthood. You can make all the difference now. Don't spend years after your DD has flown the nest with nothing but regrets and what ifs, you can do this OP, and I, as well as many others are right behind you, backing you all the way.
Please keep posting OP, we are here for you and your DD.