Standing is simple; you want to be married and thus you live as though married even in the absence of your spouse. You don't have to do anything but live. Stand by being married. While you are doing that, focus on your Self, focus on healing; two broken people cannot make a marriage work.
Should you Stand? Why? When or for what reasons should you divorce? Leaving a marriage without first working to heal the relationship, deal with problems and learn from any mistakes is risking repetition in future relationships. This is true and important even when you are the only one working toward these things. To discard a relationship without seeking growth and healing is to offer damaged goods to future partners. When faced with marital crisis, you have choices.