Hmm, right now because of the quarantine me and my gf have been together 24/7 for the past few months and she knew she has to leave the house sometimes just to let me be, it's been this way our whole 8 years.
But last year I was genuinely and completely isolated for 6 months. My gf took a semester in another country, we don't really have any friends, both mine and her family are cut off since they're the classic racist/homophobe/entitled/boomer stereotype kinda people, fuck them. So anyway, I legit went full retard (mad) the last few months with no human interaction except cashiers when buying food or alcohol (my gf is rich so she provided for me, hence I didn't work).
Afterwards I needed therapy to even talk with humans. Few of my solitary adventures included throwing knives at birds (never got cought), learning opera singing, naked (public) forest running, writing the same few pages on paper everyday, burning the paper, wiriting it again, and now I have the full passages etched in my memory forever. Pretty much I went full schizo. Pls don't try it at home.