One girl is blackmailing me .that she will lodge police complaint on me

I met one girl in fb. And we became good frnds ..shared our past. ..i told about my ex and she told abt his ex. Another day she started asking abt my ex and started blaming me. And said our thinking match. And there was a arguement and nxt day she started treating me bad. She said me illiterate .gave bad words. And commented bad about my profession. .and one day arguement got bigger. And she tried to showoff. She started sending her frnds said she he is gentle men and u respect girls .. although i respected her and nt even gave her one bad word. And she blocked me so in anger i texted her. What ever ur ex did u deserve it and bcoz of these u got famous.( Actually in her past his ex bf n her both had sex and due to her karma. He recorded it and leaked the sex video among his frnds) so she did police complaint. So on these statement which i was told in anger ur bf did correct u deserve. She started blackmailing me. And she told her frnd to act as police man. Bcoz of her my life became hell . So what to do now??