If all else fails, the final way to deal with jealousy is to seek professional help for your irrational feelings and thoughts. If you can't settle this issue yourself, then don't hesitate to ask for assistance.
In the meantime, if you don't think you measure up to your male competitors, take the time to do a little self-improvement: work out, learn new things and get a new look.
A word of warning: if a woman really wants to cheat, she will. No chastity schemes will keep her from it, so you might as will live your life and let the chips fall where they may.
Is cheating a reality in your relationship? Check out our other lists, Top 10: Reasons To Tell Her You Cheated, and