Haven't posted for a long while but have remained a committed lurker 
After splitting with XP, I now have a lovely new DP. After hearing DS (19mo) say his name the other day, XP is now demanding to know ''how much quality time my son is spending with this stranger''.
In short, I replied, that it was none of his business and that how DS and I spend our time and who with, is up to me when DS is in my care, as it is when XP has DS.
Apparently, I am ''completely wrong''.
I thought it had been dropped but it has started up again today : ''I want to know how much time he's spending with this other guy and if he's sleeping at yours/you're all playing happy families. As you have the biggest influence in his life, it is my business.''
Once again I told him I don't have to answer to him, he can't micromanage my new relationship, that DS and DP see as much of each other as I, as a responsible parent, see fit, and that I don't need XP's permission.
Now XP wants to meet face to face to discuss further. I don't see what that will achieve, since I will still maintain it is none of his business.
Surely he can't control my time and invade my privacy to this extent?