Fraud and continous threatening.

I was in a relationship with a person since 2012, he established physical relationship on the pretext of marriage, he never intended to marry me though which I’m realising now because he never introduced me to his family, he never mentioned about this relationship to his siblings as well. He got engaged on 9th july 2018, we met one day before his engagement but he didn’t tell me anything about his engagement, he even met me next day but he was quite normal in front of me as if nothing happened. On 21st july we were together in his car and suddenly i noticed a ring in his hand and then confronted him, he told me about his engagement that day, almost 15 days after he got engaged. When i pressurised him to call off his marriage and talk to his family about our relationship, he started ignoring me. He also demanded sexual favours from me in these months, he threatened me to viral pictures when i denied. He even forced me to watch pornography in his phone and tried to derive sexual favours on 21st December even. Initially I didn’t want to file case against him, so i approached gomti nagar police station on 6th jan just for getting my pictures back, when he came there with his laptop and mobile phone there were no pictures, he already deleted all the pictures. After all this happened, I called his dad so that i could tell him what his beloved son has been doing since years but he didn’t come to meet me and called my mother and threatened her to call me and ask not to file any complain and that day onwards they have been torturing and threatening my parents by calling day and night to shut my mouth and not file any complaints against them. They also sent me a declaration stating that we had friendship between us and nothing more than that and I won’t file any case against him in future, which i refused to sign. They were also threatening me to file a case for extortion, to which i replied that you guys are free to do whatever you want just be prepared to bear the consequences of false FIR as there is nothing about money or something between us. His father said that I’m running behind his son for marriage and he’s not interested anymore. I also asked him to come n meet me along with his father but he don’t have the courage to do so because he don’t want me to reveal his real face to his family. Now my family is afraid because if i file case, society tantrums will be there and later my future will also be affected. He’s getting married on 7th feb, i asked him to compromise this by getting married to me but ofcourse he’s not interested now. Its been six years with him and I’m going through a mental trauma after seeing him doing all such acts, at times i feel like ending my life but it will potray that i was wrong and a coward that I couldn’t face the reality. My family is not supporting me because they don’t want me to create any scene in media and society. Suggest me something that i can do in this situation.