Morning brave ladies. 
Leo - my DD has a different father to Nemo (my DS with Complex SN) and obviously, there has to be some level of contact between us. DD is now 12 so it is much easier as she will talk to ShitForBrains rather than me having to.
Thing is, at the start, he would come round on the pretense of wanting to see DD. At midnight. 
He was married and in the end I threatend to call his wife and tell her what he was trying to get up to unless he fucked right off. Amazingly, it worked. But there was a lot of "let's have another baby, let's try again, let's just be fuck buddies then"
But, there was a time when I felt that maybe I should keep him happy so that he didn't try and take DD away from me. I was scared to death that he's take her. I'd be sick and shake for hours when she was out with him, scared I'd never see her again and he'd take her to hurt me.
You know, single mother, living in a Housing Association property after being in a hostel, on benefits, only working a few hours a week, no permanent father figure in her life................
Anyway. It got to the point where I thought actually, why am I doing this for him? Surely DD is the one that matters in all of this and that's what I told him, that from now on, we only talk about DD, no calls, texts, visits.....
You come and see DD when we arrange it and you stick to it or I will make sure that you don't see her, come pick her up, take her out etc and that's where the contact ends. It has to be regular and it has to be for HER.
She is now at the point where she doesn't want to go and see him that often because she is growing up, has other interests, wants to stay with Nemo and help look after him. She's not daft and has asked why we split.
I haven't told her that her father was shagging anything with a furry front bottom within a 20 mile radius of where we lived. I told her that we didn't love each other anymore and that it was better that we didn't live together and be friends, than be together and be cross and unhappy all of the time.
Maybe, when she's older, if the need presents itself, we'll talk about the other reasons we split.
The thing is though, now that she is moving forward in her life without him, he is clinging on to every last moment with her. He has other children in their 20's and his wife has 4 children and a granchild too so his life is busy!
It will get better as she grows up Leo, it will also get different.
Has he got a new partner? Or, more to the point, have you? Sorry if you've already said, I kinda skim read your post. 
Oh, and welcome x