Where to find real friends when you’ve only have work friends??

Been thinking about this lately cause I switched jobs 6 months ago and haven't talked to anyone from my old job since my last day even though we were "close".

Like we'd get lunch together and talk and complain about management, also do happy hours sometimes. But the second I left the contact stopped and I’m realizing maybe we were just people stuck in the same building pretending to like each other?

Idk maybe I'm cynical but it feels like work friends are more like work acquaintances with better marketing…