well honestly there was a time right after it happened that of course while I didn't blame me, I always wondered what could have been if I had reached out a bit more. The thing is, he didn't seem sad in the messages we were having with one another. Now I suppose you could say that I am a bit traumatized by the whole situation and if someone contacts me that I haven't heard from in years, I worry that it might be a similar situation.
The attitude situation was similar though with my guy as the one you described. I was never really all that active in FB but I would see comments from him towards people I know he has been friends with for a long time and they were overtly aggressive to the point of revealing quite private information about them. He was always on the attack it seemed.
Anyway... he's gone. and nobody that I know that was close to him had any idea that this was incoming. What can you do?