It is about upsets . Most likely, if you look close enough, you may find that an upset is rarely about the apparent 'reason' for the upset. An undelivered communication Rarely will you find someone tell you the true reason why they are upset.
People are cagey about their true motives, thinking that it reveals too much of who they are.
When you honestly tell someone your true expectations its easy for others to dismiss them as unrealistic. Also, your true expectations reveal what you value most in life, thus pointing out your greatest weaknesses as well. The other aspect to revealing oneself to others are the plan you have for the future. Not just what you would like the future to hold, but what you actually are planning on accomplishing. There are many 'thwarted intentions' scenarios that all of us can recall.