Thank you for the vote of confidence. I don't think I'll be rattled, I just don't want to shoot the breeze with him or her. As if it's OK, because for me it isn't. But I have to consider the kids, so I'm thinking avoidance is my particular best option.
They know. Should he ever acknowledge or apologize, my thinking might change. But I've managed Ds graduation, including pictures for her with both of us in it and dinner with a dozen people without ever speaking to him, so it can be done. It's a dance.