Answer “No one is bound to reveal the truth to someone who does not have the right to know it” . The security of others, their right to privacy, and a respect for the common good are reasons for keeping silent or being discreet in our language concerning matters that should not be disclosed. It is also for these reasons that gossiping is a sinful violation of the privacy of others.
Professionals such as politicians, doctors, lawyers, psychologists, and others in positions where confidences are entrusted should preserve confidentiality, unless there is a grave and proportionate reason for divulging the information. The same is true about ordinary personal relationships in which confidences are shared.