Well in my case, I have defined a certain threshhold beyond which I don't trust people IRL. And this threshhold is usually same for everyone. And people with their acts and attitudes change it, sometimes they fell below this; others win more trust, and I tend to put more trust in them. But number of instances of the former are more than the later. Most people don't seem to value the importance of trust and dependability. But it's their choice...