Imagine a situation where the person is dying of liver cancer, but is in a state of denial and therefore risking their health (by perhaps not complying with medicine or drinking or whatever). Someone who loves her partner and feels that the therapist as a health care professional might have more weight in getting through to the person might put in a call out of concern. This is not tattling. This is about someone's welfare. To not do so would seem to me to be inhumane and unethical.