Well, you can only change yourself. You cannot change her. You may (now or in ten years or whenever) become the MOST perfect, MOST faithful, MOST devoted husband that ever was....but that will not change how she might feel. You can try, but some people can never get over something like this. And that is their own thing, "right" or "wrong"....

When you step outside of the definition of what she wants in a partner, then it's really her decision to accept it or not.