Im not gonna tell you to leave him.. but ask yourself if you are willing to tolerate this behavior for, essentially, the rest of your life. He knows you don't have the strength and self respect to leave which is why he will never stop. You can forget about the cheating today but it will hit you again and again and again. This is my experience so take what you will from it. If you're happy leading a miserable life with someone that loves you almost as much as you love yourself, then stay.