She divorced her husband after his betrayal (of her). [=after he had betrayed her]她在丈夫出轨之后离婚了。

He felt that accepting the money would be a betrayal of his principles.他觉得收下这笔钱就违背了自己的原则。

acts of betrayal背叛的行为

feelings of anger, helplessness, and betrayal愤怒、无助和被出卖的感觉