How to deal with matter of threat and mental harassments?

I was in a toxic long distance relationship with a girl who was working as a nurse in Mumbai for 2 years. She used to fight with me a lot on call, she was very insecure and always used to doubt me, she used to insult my friends also if I make call to them, I tried breaking up but she used to blackmail stating she would suicide so I continued to talk to her. She insisted me to meet at least once which I agreed upon, she arrived Kolkata and she was there for 2 days. Then she left for Mumbai and again started doing toxicity and I was compelled to break up with her. Now she is threatening me of suicide, filing police case, saying I have raped her and she wants to marry me at any cost, I can’t marry any other except her. She even visited my home twice. Please advice