Tim Fletcher explains the trauma of betrayal, a central element of complex trauma, especially in children. He defines betrayal trauma as a violation of trust by people or institutions important to a person's survival. He lists five types of betrayal trauma, including parental, intimate, interpersonal, religious and institutional contexts. The source describes children's reactions to betrayal, such as minimising or blocking memories, as well as emotional, cognitive, physical and behavioural symptoms in adults. The video emphasises the need to acknowledge the betrayal, not to blame oneself, and to allow oneself to grieve, while stressing the importance of professional help and the gradual rebuilding of trust.