When I was in a mental hospital when I was a teenager (after but not directly related to my suicide attempt), I met someone my age that was there that just instantly clicked with me. What I needed more than anything was someone to talk to and feel comfortable around, and they were that. I was there less than a week but we hugged when I was leaving like we’d known each other all our lives.
I don’t know why we never exchanged contact information (it might have been forbidden by the hospital? Hard to recall), but I think about that at least once a year and am happy to have met them.