A guy Blackmailing me for marriage

Hello, Me and my family is being blackmailed by a guy and his parents. The guy and I met through a matrimony site. Our family met for same reason. Both side decided, we should get married. However, no ritual or formality was done just words Were exchanged. However, I was very confused for the guy and my family said everything is up to me. I told the guy I need time. After few days, I said No. He started crying n said he will cut his hand. I got scared, so we continued meeting. Whenever I say No he do something horrible like stalking me n torturing me. I couldn't tell my problems to anyone and forced myself to accept him. However, after 2 months I got to know many things about him.. like he has done drugs like cocaine etc in the past, for sake of money he is marrying, and his father had bad eye on me, his mom is an evil women. His family started dominating my family when they discuss anything about marriage on call. So, my parents decided not to marry this guy. But then his parents started torturing me and the guy Blackmailing me as he has my pictures. I never shared any pictures. He took it in instant. He read my personal dairy n so he blackmailing my sister n brother telling he knows all secret of thier personal life n I will distroy all. They sending my personal pics to my parents n brother n sister. I went to police station n complaint the same thing. Guy's mom asked me to take complaint back else she will do bad to me. I requested police take his phone n delete everything. The guy was along with a friend, his friend bluffed the police and dint delete everything. I thought it is deleted and so peaceful came back to home town, left my career n the city. And decided to learn from mistake n Don't trust anyone now here after. Also, after police thing, his parents gave me commitment that nothing will happen now. However, after a month it means 3 days back, again all pictures he has sent to my family members and again same blackmailing n threatening started. His father abuse me by saying I will ruin ur diginity in front of society. He tell that he will come to my home. My brother is dealing with this shit but I'm afraid as the guy said he has a video of mine which he will upload in every social media. I have text msgs from his end stating the same and I have call recordings also. Please tell me one thing, I know I made a mistake by spending time with him but then which law says a gal should get married to same guy with whom she had spend time. I rather die or stay single than marraying him. He just say why did I spend 3months with him..he just can't take the rejection n so he has made mine n my family life hell n no one has right to do this. Please suggest me n help me out.