Jesus goes on to discuss lust and divorce:
You have heard that it was said to those of old, “You shall not commit adultery.” But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart. If your right eye causes you to sin, pluck it out and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell* (Gehenna). And if your right hand causes you to sin, cut it off and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell* (Gehenna).
Furthermore it has been said, “Whoever divorces his wife, let him give her a certificate of divorce. But I say to you that whoever divorces his wife for any reason except sexual immorality causes her to commit adultery; and whoever marries a woman who is divorced commits adultery.” (Matthew 5:27–32)
Divorce is so often a breakdown of the Golden Rule. As with anger, little things are important—for example, the roving eye. Sexual lust starts small, but if not stopped, it will grow in stages till sin, hurt, and pain result, especially to traumatized children. Where is the Golden Rule in divorce? Where is the respect and honor for one another and for promises made? Where is forgiveness? On both sides?
Jesus often used hyperboles to emphasize important matters: Rip out that offending eye and avoid Gehenna! He is saying to get rid of that lust while it is still small, or it will grow! The best way to dispel evil thoughts is by doing good—yes, by actively working at helping others. That action has amazing power. Good actions do not feed wrong desires. The test is always the same with marriage problems: How would I want to be treated if I were the other person? And we need to look inside ourselves for that small beginning of sin—and root it out of our lives.
The Golden Rule Explained By Peter V. Gregerson, Sr. 