We have all entertained some not too great thoughts about our marriages, ourselves, our lives etc... However, I guess if it were easy the divorce rate wouldn't be what it is. You have a choice here. Continue your marriage and keep working to make it a marriage that you receive value from, enjoy and can embrace OR don't stay married. There is no in between. Having an affair doesn't solve anything. Fantasizing about having an affair keeps you from doing something about your situation. The very best of luck. We all have weak times. You are having one. Strengthen yourself and decide whether you are staying or going.