On the other hand, there are many success stories of friends who went into business together and succeeded to together. If you have ever gone into business with a friend, what were your biggest concerns and how did work through it.
I think that there are times when things do not go the way we want to. This leaves a bad impression on us and a deep scar, which is why the man from your story will find it very hard to trust anyone ever again. But that does not mean that going into business with a partner is a bad thing. It only matters to him because of his own bias against partnerships.
Obviously there is a difference between trust and blind trust. They are not the same thing. Nobody should trust blindly. But without trust, there is no cooperation and no point in any business, because anyone can screw you over. Not only your partner.
Statistically, most partners do not do this to each other. The guy was just very unlucky that it happened to him.
I would not take his story as fact on the matter.