Wow, you're allowing him to bring the kids around OW? I would absolutely not tolerate that, and in my state, neither would a judge.

You might consider how confusing and upsetting it is for the kids, and look at having some sort of clause put in your parenting plan.

H: 39, Me: 37
SD: 18, S: 7
M: 9, T: 10
"I love you but am not in love with you" - 5/11
Discovered online affair - 7/11