I'm talking specifically about when it involves another person they KNOW you're close to.
When I was with my ex I was extremely close to his sister. She confided in me that their Mother had an affair years earlier and to be honest it explained an awful lot about her marriage (she stayed with ex's Dad). It would have answered a lot of his questions but she told me not to tell him.
Yesterday, I was put in a similar position about a friend and I'm already keeping something else significant from her that I was told years ago.
I pride myself on not ever betraying confidences (unless I think someone might get physically hurt) but I really begrudge being put into this kind of position. I only hope that if third parties ever find out I knew they also know from experience that I do keep to myself what I'm asked to.
Why do people put you in this position?