And an inappropriate one.
You keep claiming nothing inappropriate happened yet it did.
And that doesn't even get into the banter.
And you're also claiming you can never be tempted. Christ on a cracker, you already are. Because if you weren't, you would take or leave her and get out of the situation. Instead, you're doubling down and digging your heels in. You're trying to make excuses for continuing.
Also, have you been talking to your wife about all of this oh so friendly banter? I'll lay odds you haven't -- and that's not what a person who is ironclad-can-never-be-tempted would do. A person who couldn't be tempted would bring it up with their spouse or significant other. "You'll never guess what Jane did the other day...."
If you haven't been having those conversations, then you're being secretive about this. And that's can make it oh so easy to cheat.
And as for never, ever, not in a million years temptation -- one of the ways we resist temptation is by avoiding
it. You're not bucking for sainthood here, fending off temptations left and right and wearing your hair shirt.
You're a middle-aged guy who's lapping up a bunch of overly suggestive, inappropriate attention from a younger member of the opposite sex. And you're enjoying the naughtiness of goofing off while on company time and keeping it secret from your wife. Don't sugarcoat it. That
is what is happening here.