[brailsafe]

That's a tough call, it's scary because of the surprising nature of it. My first encounter with this was a close friend I'd grown up with and who was also seemingly quite intelligent. He'd had one violent incident in the past involving weed that triggered some kind of psychotic episode that was waiting to happen, and then nothing for many years, until he started down this paranoid pseudo-science veganism and yoga cures all diseases, fasting, breatharianism type direction. Apparently there was more happening that I didn't see, started keeping weapons around, lots of psychedelics. In retrospect, he was almost certainly schizophrenic, ended up attacking someone during a psychotic episode and unfortunately his life ended early and dramatically. After that, some of the signals became harder to ignore, and noticed that another more distant acquaintance started repeating similar things as your friend, except on LinkedIn of all places. Many delusional, spiraling paranoid posts of grandeur (not in the typical weird way everyone does on that platform), describing the government coming to get him after he isolated in the countryside. I think he's fine, but reported him so his reach was limited.

Personally, I'd get out and try to at least temporarily part ways on good terms, not necessarily forever. Depends a lot on vibes. It's tough.