My ex is an unstable person- hospitalized several times for his mental illness. He persists is telling people we know that I am harmful to our children and that if it weren't for the money he would call DSS and take them away. Most of our friends and family know this is a lie, but it is still very hurtful to me. I have worked very hard to keep our children safe and happy through a difficult time. How can I get him to stop?