If you have to interact with your ex in social situations how comfortable are you with that?

I have to interact with my 2nd ex quite a lot because of our daughter's schooling, and also because our daughter is a Cub Scout, I'm a leader at the scout group, and my 2nd ex is part of the scout group committee.

So we have an unusually large amount of regularly interaction.

I'm always stand-offish around my 2nd ex because I have 13 yrs experience of knowing how she operates. So I know never to fully trust her and I know how her narcissistic control-freak personality works.

Do any of you have a lot of interaction with an ex because of things your kids are involved in?