You are very brave OP.
I can share my story with you. I lived with my daughters father and experienced horrendous domestic abuse, we got to a point where the local authority got involved and I had to flee there and then. I left our entire lives behind in the area we had known for several years, in addition it was an accelerated flee because the risk escalated which meant I had to leave all our belongings behind and start from scratch.
I relocated hundreds of miles away from him, but I was scared - really scared as I have no family support and my friends were in the area I originally grew up in, but in honesty - it was absolutely the best thing I could have ever done.
We're three years away from him now, my little girl is settled, we live in a lovely area in a lovely house which we have made as a home, we've made lots of friends, both her and me, and she starts primary education this year in a lovely school. I felt so frightened and isolated when we first moved here but honestly, I look back and only wish I had left sooner.
I can absolutely say with every fibre of my being that this will be the best new start for you as well as your children.
You will have some doubts when you first get there, that is natural and you will feel isolated at times, but as time goes on your children will make new friends and so will you and you will then realise this is the best thing you ever did.
Whilst I imagine some part of you wishes the children's father was involved and cared, him contesting this move would be a huge obstacle for you so please see this move as obstacle free and an incredible new start for you and your children.
xx