chickipo, I'm so sorry to hear about your friend. Usually people don't know what to say, think or do when this kind of thing happens. I have been there. A lot of times they want to blame the person who did it because they are simply not capable of comprehending why someone would do that. It sounds like that guy is victim blaming. It's a common reaction.
I am also sorry to hear that the mental health industry let him down.
And also that people shamed or guilt tripped your friend. Unfortunately these reactions are all too common when it comes to mental illness.