|The Simple English Wiktionary has a definition for: betrayal.|
In an article made by Rodger L. Jackson, it says that "there is not much definition for this word". In psychology, they say betrayal is the breaking of a social (friendship) related things. But for some people, for example, philosophers called Judith Shklar and Peter Johnson, a person can understand the word better by literature (writings).
Betrayal trauma happens when someone that a person trusts betrays their trust, and it messes up their memory because of anger. An example of betrayal trauma is childhood physical or childhood problems. Betrayal trauma is similar to post traumatic stress disorder. The difference is that post traumatic stress disorder (PTSD) is made by fear. Betrayal trauma makes a person fight, and also get into serious crimes for example, discrimination or bullying.