What a total arse he is.
I went through a period of ex messing me around with the DC. He regarded me as 24/7 childcare and he dipped in and out when he fancied...whilst paying zero maintenance.
I think this is a form of control and he will do it to piss you off and try and make life difficult. It's a subtle way of saying life is going to be difficult....you should have accepted me back
Trying to be civilised about our split, I obliged this and felt helpless to refuse access or object to cancelled access.
It took a very confrontational time of me being much firmer before he changed
All access was then agreed in writing. It was agreed after negotiation and I refused to change my plans to oblige him. I felt I have had to fight back to ram my point home. If I didn't, he just took the piss time and time again. Sadly the consequence of this 'fight' affected everyone incl DC, but despite trying to avoid it ...he pushed and pushed relying on me not to let them be affected.
I bitterly regret him forcing me into it but don't regret doing it. It settled once he realised I wasn't going to be a push over and point was made. We now have a v civilised contact arrangement (he barely sees them but that's another story)