The behavior you just described (dressing sexy, making sexy jokes, touching him in a seductive way etc...constitute a kind of "nagging.") are things that I would do...that like you said constituted "nagging"....and because he would give me the impression that I was pressuring him, I stopped doing those things. BUT....that's exactly the type of behavior he was looking for online.
He couldn't reconcile his "sexual fantasy" with his wife and mother of his son.