Her new boyfriend around the kids already?
So my ex has been dating this guy for like 3 months and he's apparently at her place when the kids are there. I don't really know him and my oldest mentioned he was there during their bedtime routine. I'm trying not to be that guy but it feels weird. Should I say something or is this none of my business? We're supposed to co-parent but stuff like this makes it hard.
Three months in and he's already a regular presence? That would bug me too. I'd definitely talk to your ex about introducing new people gradually - your oldest picking up on your discomfort makes it a bigger deal than it needs to be.