1. Avoid being alone with her. Ensure that your spouse is with you whenever you must be with this person. If not, tell your spouse ahead of time and/or immediately afterward.
2. Stop fantasizing about being with her romantically and/or sexually.
3. Don't open Pandora's box by telling her that you are sexually attracted to her. It will only complicate matters more. She may turn around and accuse you of harassment.
4. Share your feelings of attraction with a close friend who can hold you accountable.
5. Take responsibility for all your actions. You are not to blame for your feelings but you are responsible for the actions that follow your feelings.
6. Try to look at the whole picture. A few moments of passion can lead to a lifetime of regret and hurt.
Taken from The Sexual Man: Masculinity without guilt