I'm just an autistic incel with zero experience with relationships, so take my input with a grain of salt. But when I was talking to that one and only girl on Reddit, I was only supportive about her suicidal ideation - and even though I did put forward an argument to check out life, I would never try to dissuade her from her decision, manipulate her or summon authorities (if I could).
But other people might be less direct, no idea. Normies seem to hate honesty, and will fuck you up.
I did experience ghosting, so if you were to heed my input, I'd rather you tell him directly to fuck off. Unless you're afraid he might kill you or something - again, not too sure how normies behave. I for one would like a official closure, but YMMV.