You need not be so disappointed when you are disappointed. Disappointments are not the huge catastrophes you have thought. Start to consider disappointment a good thing. Good comes from it. Certainly when you are disappointed, you become more aware of who you are and how you conceive the earth you live on.
Let it be beautiful that someone or something disappoints you.
Let it be humbling.
Let it be edifying.
And then let it go.
Disappointments are only disappointments, brief hit and miss in life.
You learn how other people see the world you share. No two see it alike. Do not think your view is superior. All you know is that your view is different. Naturally, your view seems right to you, honorable, or even necessary. According to your view, you act. According to what you see, according to what you interpret, you act. It is not for you to chastise another because he sees differently, even if, by everything you know, he is wrong.
You are not to castigate another for seeing differently from you. It is not for you to teach another the mistake of his ways. It is for you to rise above your own vision and cast love. Then the other will be more open to seeing life in the vein you do.
One who sees differently from you and disappoints you has not committed a crime. The most he can have done is made a mistake, tripped over a stone, spilled some milk. He has only gone along according to his interpretation of life, just as you have. He has walked according to the signs he saw. Perhaps he did not see well or did not know how to read.
His path may make more turns than yours. It may have more in's and out's. The fact that he skips around differently does not have to injure you. Why take offense because someone sees the harried world differently from you?
Do not interpret what I say as permission to anyone to do anything to anyone any way he wants. No, no one is to go into your house and steal. Nor do I mean you must allow it. Nor do I say you must hand over your goods. Nor do I say you must have many locks on your doors.
Look, someone or someone is going to infringe on what you believe. Must you be astonished? Cannot you laugh as well?
When someone's action is an affront to you, you will feel that your rights have been violated, and as you see it, they have. And they may well have, according to everyone's view and the view of the entire history of the world. Only, it wasn't the way he saw it, or saw it at that moment. It is not for you to throw the violator away because his eyes were dim or clouded over and he simply did not see the way you did. Perhaps he did not even see you enough to consider your wants, or perhaps it didn't occur to him that you wouldn't see through his eyes.
It is for you to lift your eyes higher so that he may open his. Rise above your own creed. You are more than an admonisher in life. You are someone who goes a step beyond.
Someone abrogated your rights? Then let that be taken note of, addressed, resolved, and know it makes no difference to love.
The last time you made a mistake, what response could have helped you to see differently? What response would have made you never want to make such a careless mistake again?
What do you think "Do unto others" means?