violate the confidence of

See: betray, inform
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He would see the parties married, and then violate the confidence of the man who had taught him that trick; he would divulge the secret and so remove somewhat of the obloquy that attached to his niece's fame.
An editorial writer should never violate the confidence of a friend, or any other source.
We need better policing and stricter penalties for insurers who violate the confidence of consumers," Tocklin said.