They’re 3 and 1.
I don’t hate their dad, but he can be so selfish and not very thoughtful. I’ve fallen out of love, after a million small things combined. I would never stop him seeing the kids, I will never argue with him in front of the kids.
If anything I would really like to maintain a healthy, friendly relationship with him for their sake.
Is it possible to do this without massively effecting them?
YABU - however you do it, they’ll be negatively effected
YANBU - if you do it right they’ll be ok