I've grown apart from a bunch of my friends, but definitely never on negative terms with any of them. I'd say there's probably a solid dozen people who I'd feel confident entrusting my life to in any situation, and another 4 or 5 that could be trusted in many situations but not all.
I dunno. You could say I trust people too easily, but I would contend that I'm just a solid judge of character. I'm not one to make up my mind about people, either so these people have continually proved to be 100% trustworthy in my book.