I think maybe you should have a mental health professional take charge here. If I were you, I'd share the information with a licensed psychiatrist or psychologist right now.
I was acquainted with a guy I ran into a bar once when I was young. He said he was going to kill himself soon. I called his XW, friends, maybe family. None of them did anything. He killed himself a few days later. I should have called 911 or the local mental hospital.
