The old saying in this new world is called tough love, you remove them from your life completely and eventually they may or may not see the light. In the long run life is too short to be unhappy and alone, if you want him back tell them they are no longer welcomein your home and to stop spreading lies as the legal system has things to say about liable and false utterings.
Blessings and good luck:
P.S. You must grab the bull by the horns and take control to make your life bright and joyful.