@monomatapea If you and your dh need to have those boundaries that’s ok.
I still think it is sad for the kids involved and ultimately unhealthy for them to be exposed to this kind of hostility regardless of who is at fault.
In general, I still think it’s better for the children if the adults can resolve their issues. It takes all adults involved and sometimes one or all of the adults are just not willing to do this.
If your dh tried to create an amicable parenting relationship but the mum refused, then it’s fair enough to have boundaries.
If he didn’t make an effort to be amicable and holds onto old resentments and treats her like the evil ex, then that is not ok.
If he has nothing at all to do with the children outside of the every other weekend he has them then that is unfortunate for the children. Things like being able to ring their dad and talk to him when they’re at their mums or school performances etc.
Only you know if any of what I wrote above is the case or applies to you. If it doesn’t apply to you then don’t take it on board. Easy.
Most people who have split up have issues of hurt from the other person. It doesn’t mean that you have to hold on to that after ending the relationship. If you didn’t have children together you could move on by never seeing them again. But with kids involved it is different.
And as I mentioned earlier domestic violence is an exception to that. (Not saying anyone in your situation is involved in domestic violence just want to note it for anyone reading this thread who might be going through that).