Namechanged for this one, for obvious reasons...
Briefly - Last year I became good friends with a male collegue. I found out that he has Hepatitis. This is a secret that he shared with me in confidence, nobody else at work knows. We had a falling out before Xmas and aren't really on speaking terms at the moment.
I found out today that another friend at work had a one night stand with him. She told me and was all silly and giggly and said it was great fun. Now I suspect (although I don't know for certain) that they had unprotected sex. This girl is a good friend and I'm sure she would have mentioned the fact that he had Hepatitis if she had been told by him...
Basically, I think he may well have had unprotected sex with my friend and not told her he has Hepatits. I have been thinking over what I should do and think I will ask her tomorrow whether they had unprotected sex ir not. Then, if she says yes I will have to decide whether to confront him about it or whether to betray his trust and share his "secret" with my friend for her own safety.
AIBU in telling her? Perhaps I should just keep my nose out of things but it just "feels" like I should make sure she knows the score.