It's also easier to have substitute "network" relationships which are not complete.
Abd it shows we're geared towards living in relatively small communities whee everyone knows everyone, but new forced mobility breaks that, and so do long work hours. (I believe the optimum size is somewhere around 10k and average 30h workweek, more bursty.)
My personal solution to what almost happened to me was to fix the underlying problem with medication and start building from ground up. It took two lost years of my life (funny enough, during studies) and it's always a risk of relapse...
The solution is unfortunately to get really creative in finding actual humanity around. It's rare but happens.
It is actually quite hard for an adult to find an actual connection who isn't a spouse nowadays. You get to dig into weird social spaces like clubs (some are really niche too) and there are few guarantees. It's also for some reason harder for men because women still tend to build minimum social groups as a reflex ("coffee clatches" or rumour Mills)
A lot of it is extremely superficial too which can be annoying.