Originally Posted by Gigi
So my question is mainly around how do you interact or not with your exs other half?
I don't. My XGF and I both set firm boundaries around that.

My XGF, when XH came to pick her D up, would send D out the door to XH's car. In this way she didn't see XH or his new GF for years at a time. No "acting nice" or "acting mean". My XW had one partner who often drove with her to pickup the kids. One day she asked me if I'd like to meet him and I saw the passenger door opening. I said "No", turned around and walked towards my home. To this day I have no idea what he looked like. These are stable configurations lasting 10+ years.

Originally Posted by Gigi
most often it happens at a kids club. Im obviously there for my kids,
I understand big events--talent show performances, piano recitals, etc--but if this is a regular weekly thing, could you go on your days and them on his days? Given these interactions are causing you stress?

If it's important to regularly go to the same events, yes, I'm with your son, you don't have to be chatty but be polite to her. Treat people as you would like to be treated. Treat her like that Starbucks Barista. It's common to project our anger onto our ex's partners, but she didn't break any promises to you--he did. It sounds like she's doing a good job building a relationship with your little one. That's one more person your little one can lean on when they're struggling.