Since they don’t have children, I see no reason for them to be in touch, let alone going to each other houses. When people have children, there sometimes are reasons to keep contact even after kids are grown (weddings graduations grandkids etc). Ex and I keep in touch. But certainly not fixing things for each other or what not. So id be livid! That’s not acceptable.

As about families I see no crime for families to interact in a limited fashion. My brother is friends with my ex husband. There is no harm in it. I speak to ex in laws. Granted we share a child, although she is grown up.

I think if people have no children and in addition weren’t like married 30 years they need to not fix anything in each other’s houses and go to each other houses and be in constant contact. That’s crazy. I’d not like it and wouldn’t put up with it. Neither should you imho