Personally, I would have no problem with this situation. And once the infatuation is at it's pinnacle, I would seek written permission from my Lady to betray and demean her and she would say fine, go ahead, just come back home later and clean up.
She would also hand me my pre authorized application for an immediate autopsy with her approval for a pre death autopsy and instructions to go there first and get the matter taken care of.
I understand your dilemma, I have been there also, but regardless of whether your wife gets hurt, she will see the betrayal in you because you know what you have done. Women know!
Put this down as one of the questions that if you have to ask your wife for permission, you already know it is wrong.