Betrayal... Hardly the worst thing that can happen in a person's life. Betrayal is almost like death. The death of trust and intimacy. Betrayal is like the deliberate humiliation of a loved one.
What is betrayal? After all, we all sometimes deceive the family, but usually it is not a betrayal, but only an attempt not to offend or unwillingness to quarrel. In my opinion, betrayal is a conscious deception expectations person on account of you. For example, you convince someone who considers you a friend that will go with him to the hospital, because he is very worried but at the time I know that he would not go anywhere and will not even warn. That is a betrayal is a conscious lie that people can count upon you.
So all - in friendship, love, work - in any relationship between people. Sooner or later about the betrayal becomes known, and the person will hurt, because he would know that for a long time he was insincere.