The way I see it, and have experienced it, is that it is easier to have a cordial relationship when you have kids. If you still want them back, or you still harbor animonsity, or you are still afraid of "letting them off the hook" then maybe you aren't ready for continued interactions.
It's been a LONG time for me, but I sit with my ex and his OWW at my daughters events. Our conversation is comfortable. It is better for our daughter to see. The thing is, I can do this because I have no desire to have him back and nor do I have a fear that I am "condoning" their R. They know what they did, they don't need me teaching them a lesson.
I am not saying sit with OM. I am saying yes, she is probably warmer because the conflict is not there due to NC. You both were married, you are both parents to that child, so yes, convo will be natural and easy at times.
Unless you feel as if it will hurt you in some way, no reason why you have to be completely NC. A conversation at a S basketball game is a good thing as long as it doesn't affect you negatively.
