Coparenting boundaries... how strict?

My baby dad and I broke up seven months ago. Honestly, it still hurts sometimes. But I’ve dated around and focused on myself and our son and work. We have very strict boundaries. We only talk about our son. We follow visitation guidelines. Meanwhile I see a lot of these coparents actually do “family” things together? Like go to the zoo, movies, dinner, etc. and I wanted to know if that’s actually normal or not. My baby’s dad and I don’t ever hang out, not even with our son unless it’s a doctors appointment. I always figured that would be a bad idea. But I know some who do even when the other person still wants to be together. I feel like that would be so hard yet at the same time, I’m questioning if it’s something I should partake in for my sons sake. What do you parents do?