The same guy (who isn't my boss or isn't part of our division - he only has to use our office btw) who asked my coworker a month ago where I lived has now asked her why I left an hour early. Well, I had an appt which I ran past my boss which was all fine by my boss and I am only answerable to her, but this guy keeps asking my coworker why I left early, which clearly isn't any of his business. She tells him if he has any questions to ask me himself, but he never does.
Shall I challenge him or leave it?