Your welcome.
At the moment he's not feeling any repercussions for his behaviour though.
When my DC were younger, I found that when I wanted to go out, I had to check my DHs availability to look after them.
Whereas he would just go out and assume it was fine. I actually recall this very topic coming up on Loose Women and the panel all said the same thing.
My solution was to plan in advance and tell him what date I'd planned to go out and he needed to be in.
At the end of the day, the kids have two parents and why should all the childcare be lumbered on one parent.
Unless you stand firm up nothing will change. If you split up, he'd have them during his visitation.... Is that what he wants?
My protest once was when my DH never took leave during school holidays and I did all the time. In the end, I told him if he didn't take time off, then I wouldn't be coming on the family holiday that was booked... So he could take the DC alone and that would be a holiday enough for me.
Guess what... He took the half time off and looked after them.
Whatever you say, be prepared to follow through with it. I was absolutely prepared to and he knew it.