AnnaMarie, sorry to hear about your situation, hopefully the issue will stay in the background and the damage is minor in the scheme of things and you will continue to have a good and happy relationship.
Your situation is exactly what I was talking about and pretty much exactly why I have decided (at this stage) not to tell my wife more than the little bit I have so far. It would seem that if you had been able to offer your wife a choice she would have selected the don't share your secret with me option.
In MY opinion you should drop the subject and wait until she brings it up (If ever) and then let her ask anything she wants and of course be totally honest in your answers. If she doesn't bring it up - to me thats a signal that its not troubling her THAT much, which is not a signal that its ok.