I'm so sorry your H hasn't changed and ended things with OW I agree with starting over and lwb. Kick his sorry *ss out and move on with your life. You were finding your strength and peace with D4 and allowed him to manipulate you and use you. He has NOT changed one bit. This isn't your fault. Just as you can't heal in this situation, D4 can't adjust to some form of a "normal" future with your H there. It isn't going to be long before she understands exactly what is going on. Please get both of you off of the roller coaster.