Spying and defamation

I am in relationship with a man who was divorced 2 years ago , his former spouse has been spying on me since the time they filed for mutual petition. He and I have been friends and business partners since sometime. Their divorced happened due to her behavioral issues as she always used to instigate his own family and friends against him as he drinks and smokes. She also threatened him of committing suicide and there fore he was coping with it for 7 years and finally ended it in 2018. She has been stalking me since November 2018 and their mutual petition was signed in October 2018. First hearing was in December 2018 and decree was granted in July 2019. She and her family have been spying and stalking me and using all the information to defame me. She has a child who is 7 years old and she made several allegations and one of that is , I am the reason why her son lost his father ! My fiancée was fed up of her behavior and as his family has also been brainwashed by her , as she portrays herself as the good person , the old parents and family were against my fiancée’s will to live his life the way he wants! After all the trauma he left his parents’ house and living separately alone for now. But this woman stalks and instigate his own family members against him and now me also! Her father also threatened me in2018 and now it has become a serious concern as she has called my family members also and making allegations and defaming me and causing mental stress . I would like to report this. Will I get justice ? How can I go about this ! ? How should I present this to the cops and what can be done to stop her from stalking me and bothering me ever again? Kindly help. Thank you.