I'll keep this high level but need to check if I am being unreasonable to decide how I tackle this.
Split up with ex a while ago. Decided to meet up occasionally as friends. My DC came with me last time (been together a while, not EXs DC). Was meant to be friendly.
Ex asked DC while I was out of earshot on multiple occasions if I have friends that are men and then directly if I have a new boyfriend.
I'm cross as it feels they have crossed a line and it's not fair on my DC and not a conversation they should be having.