Anonymous wrote:You should do whatever you might normally do when you are not interested in someone, whether that is directly say, thanks but no thanks, or more subtly withdraw.
This screams crazy-time, and even if you are attracted to this guy, it's the same advice I'd give a young woman in the same situation - nothing good will come of hooking up with an older married man, and get the hell out of that situation. Period, end of discussion.
Cheater and a closet case?
Run, Forrest, Run!
Tell this guy "No thanks" and distance yourself from this guy as much as you possibly can. Don't sit next to him. Don't be alone with him. Don't go out for drinks with him. If he persists, you'll have to go to HR.