Gf cheated

I met a girl in 2014 we both came into relation in minor age my age is 17 her age was 15 then her parents divided us in 2015 and 2 men came to my home when my mom was alone in home they warned my mom and said we will kill your son if he try to talk with our girl and promised that THIER girl won’t talk with me and she won’t come near to your son and The girl n her parents started fake rumours on me that (he is a playboy he used a girl physically and she got pregnant and a kid and he cheated a girl) I asked her parents To prove this and bring that girl and kid to my home I will accept them as my wife and son after that they blocked my number and after 3 years in 2018 she wanted to meet me again I said yes then we both met again she said sorry for everything and said I don’t want to leave you and again we both came in relationship this time we both are major she said I won’t leave you I will marry you after 3 months I said breakup she blackmailed me that I will die if you leave me and again I came into relationship and she started physical relationship with me i said im not happy with this marry me I want a legal relation as husband wife she said I can’t marry now I said breakup after she refused to marry me and she started blackmailing that you used me physically and now leaving me I can’t live without you I will die again I came in relationship and she got pregnant I begged her to don’t take mtp pills but she didn’t listened my words blackmailed me if You won’t give me the medicine my parents will kill me and I said her I will talk with your parents I want to marry you and don’t kill the 4 weeks innocent baby and she promised me that In return of this baby i will marry You and give you legal babies in 2 years And took mtp medicine and killed a 4 weeks babyy without consulting a doctor then she started using my money and blackmailing me that if you leave me I will die and continued relationship for a year then she said our marriage is in 6 months and used my money for her personals and then she said I won’t like your business (fish non-veg) because I’m a vegetarian set a new business then I will marry you I said I have financial problems then she said I can’t marry you I said we have gold in home which saved for my sister marriage she said to sell that gold and set a marriage I gave that 133 grms gold to her brother he tried to cheat me then I sold it for my friend and 60k I used that gold money for her personals and invested money in other business then I asked about marriage she said no I want to marry you after 3 years after selling the gold and setting business and after 5 days her sister called me and said come to home and don’t bring anyone then I went thier home every one in the home said to leave her and blackmailed me that if you marry our daughter we 5 mems will do suïcide and my gf said i don’t want to marry you after using me physically by blackmailing used my money and killed my baby by mtp Bill now how can take a legal action on her?