My ex girlfriend torchering me on dialy basis

Hi, my name is dinesh, i keep the whole story in short, iam in relationship with one girl from 2015 and another girl came between us she started friendly and later she told me that she knew that I was in relationship so she don't want to be in relationship with me but want to be with me just for a day. Iam idiotically cheated my girlfriend and I started to have active sexual life with her for almost 2 years after that on 2019 she shared all the picture of our private scene with my actual girlfriend.. and told her the her version of story. I regret cheating my girlfriend on very first incident itself but she blackmailed me through emotionaly or hurting herself like cutting her wrist she keep me her side for almost 2-3 years.. i tried to talk with her family side but i don't get proper response. And i was in the middle of competitive exam preparation so iam not able to take proper action. I cut all the contact with her and move to my home town and settled .. but she contact my girlfriend family abusing them, talking trash about their daughter, and almost dialy basics for the past 2 year i received 1000 calls and 100s of abusive message.. i cannot even change the number if i change the number she calls other person doing the same.. now she ask me money around 10 lakh. My only source is land in my native which i ready to sell for the sake of mistake i have done.. but on the pretext getting money she dialy abuse me with words none can imagine.. i don't knw what to do . What are the legal way to handle this issue