My son is a bad person

My son is 18 years old, and he is a terrible person. He was a wonderful child and we always had a close relationship, but he turned into a cruel, abusive, manipulative, mean-spirited, evil human being. Not typical teenage stuff, he is actually an awful person. I couldn’t take it anymore, and I told him he needed to find a new place to live because I can’t have that cruelty in my home. I am so relieved that he is finally gone. I’m struggling with coming to terms with the fact that my kid is a disgusting human being. They say that a parents love is unconditional and I always believed that, but not anymore. Somewhere along the way I failed miserably and my heart is broken.