What in the heck

So I’ve been dating the same guy for the last 3 years,about 5 months ago he finally introduced me to his daughter and not long after me and my daughter moved in. He doesn’t have custody of his daughter right now he just gets her on weekends,after moving in he became very aggressive and controlling.

I ignored it,

The last two months have gotten worse than ever before,things got super weird.

I caught his 7 year old daughter fingering herself and when I said something to him he said he knew about it and to leave her alone that its her relaxing time.

Found out from one of his ex girlfriends the child has been doing this for a while..at least since she was 4,and she said that the little girl use to complain about her privates hurting all the time.

She walks around in front of her dad half naked all the time and I’ve just gotten creeped out and decided it was time to end things,so the other day I told him it was over and I was packing my things,he took my phone and started recording me and I tried to slap it out of his hand and he grabbed me by the throat and slammed me in the bed and said he would break me and called me a stupid son of a bitch and I told him to get off of me and he grabbed me by my shirt and slung me into the wall and almost broke my collar bone.

He also called my 9 year old daughter fat and ugly and told her his daughter was gonna beat her fat ass and she started crying,so he drives us to Walmart because he took back the car he bought for me,drops us off on the side of the road and leaves us for hours and comes back,forces my daughter into the car and refuses to let me in and takes off with my child...so I ran all the way to his house and when I got there he had called the cops and I couldn’t show the videos of him putting his hands on me because he wouldn’t give me my phone because he bought it.

I’m so lost idk what to do.

I’m disgusted and wondering who showed his daughter how to do the things she does to herself and why he encourages it?

Also heart broken because my daughter is so upset and heart broken he treated her the way he did over issues he had with me.

Please I need advice.