Yeah we all have to do what works for us and that doesn't make things tough for the kids.
I saw XW at a kid's bday party last weekend and didn't speak to her at all. A lot of people there so it wasn't conspicuous to anyone unless they were really watching me. She was across the room when I got there (last to arrive) and I just gave her a slight nod when she looked at me.
While texting about something a day or two later she asked me why I ignored her.
But I'm not interested in reconciling and don't have to see her much, so I'm not so much detached at this point as disinterested...and I really don't like her very much as a person anymore, and she doesn't seem to want to interact with me. So be it.