Betrayal and expectation

Thinking about failure and betrayal, I started pondering why some feel betrayed by the failure of another. We are a nation built on rugged individualism. What does it matter, if that guy falls down? We'll all just keep goin, right? Nope, somewhere it was implied, if not stated, that this person would deliver for us. Whether we made any effort or not, they let us down. We are betrayed and it is someone else's fault. It can't be possible that we chose to feel betrayed. Maybe we should have expected that we would have to take care of it, if someone else did not. We could choose to move forward and take action instead. Failure by itself is not betrayal, malicious failure is a topic for another time.
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