Oh lord.... DEFINITELY leave it alone bc u have already said Mary has a bit of a rep of bring untrustworthy and a shit-stirrer, so u don't want to go further w/"reporting" just possible gossip bc in the end it will make u look just as bad if not worse than Mary and all for what? No one knows if it's true for sure so until he does something directly offensive to u....my advice to anyone in these situations is STAY OUT OF IT, bc it always seems to have a way of backfiring.