It depends on the situation. When I managed a big company, if an employee approached me and wanted to tell me something confidential, I would explain that if it involved wrongdoing within the company, I could not be bound as my first duty to was to address the wrongdoing. As memory serves (and it's not such a reliable servant these days) no employee ever demurred after being told that.
When one of my kids has told me something in confidence, I sometimes feel that I must tell the parent of the child involved in the story, and I have been able to convince my kids that they must let me do that.
When a friend confides, however, I can promise to keep it secret to my death.










