Leaving my toxic partner

So I’m a bit nervous as tomorrow I’m finally leaving my emotionally abusive partner, we’ve been together almost 4 years and since we’ve had our son he’s turned into a different man. I have a son from a previous relationship and he treats his completely different. I have just been on a girls holiday and hit the final straw, I FaceTimed him where he then told my 5 year old I loved alcohol more than him because I was in Spain and when I rang to speak to my children he would make sure it was only him in the room for the call and proceeded to ask me 1000 questions of what I had done what I was wearing where I was going what I was planning on doing all that sort of stuff, then once I’ve come home my house is disgusting he didn’t change my 5 year olds boxers for the whole 5 nights I was gone and sent him school in dirty uniform. I’m just so worried because when I’ve tried to break it off before he’s always flipped it so I’ve stayed and I think he will try do that again. So tomorrow I’m ending things and me and the kids are spending the weekend at my parents house. Has anyone else left a toxic person how did that go?