I have a friend whose father is a psychiatrist. She (the friend) told me "if you think they don't talk about their patients, you're deeply mistaken".

Personally, I've never had one break my confidentiality (at least to my knowledge) - but the possibility is always there.

As for being "only human" - sure they're human, but unless they have a legal reason to break confidentiality, they are, at the very least, in violation of their own ethical bodies and quite possible state or federal regulations. I work in a regulated industry (that includes HIPPA regulations) and being "only human" would not fly if I were to break confidentiality.