Please Advise.. Please...

Hello Sir/Madam, Hope you are doing well... I'm writing this email to understand the Law and how anything can affect me or my family members. Please , please be patient and read this and I apologize for any mistakes in typing…. I got into a relationship with a Girl last year May. It is just going to be a year now. There has been so many things that has happened till now.. Most importantly she was not honest with me from beginning until Dec 2014, I found her cheating on me myself many times and yet I use to forgive and kept giving her chance. But I chose to leave Chennai and go to Bangalore for better prospects in terms of Career. She was rushing me and taking this relationship too fast, within 2 months she had me introduced to her relatives as boyfriend. Last year during August I happen to attend her sister’s marriage, I had told her not to introduce me to her relatives as her boyfriend yet, it was ok if she only told her parents but instead she made it public. And after few days I found her cheating on me, I happen to see her conversation with two other guys( flirty guys )… so I told her lets end it, and I was in my native at that time with my parents, but she kept calling, crying and saying that she will not cheat on me again. I spoke to my parents about her and my parents instantly said no to the relationship.. I told this to her and she Kept crying and after few minutes she posted our relationship status on Facebook without asking me and made it even more public where my relatives and everyone else got to know.. It created a lot of problems between my parents, brother & me.. My father stopped talking to me after that.. I kept telling her this is not going to work out and my parents will not agree. But because she knew my weakness & that I’m sensitive person she kept hanging on to me by holding on to my emotions. So she convinced me stating we can convince my father and mother and it is just matter of time we need to give, I fell for those words.. I agreed, again the same repeated in November, I spoke to and tried convincing my parents again about this and they said NO. I told the same to her and she said we will give a little more time and then try for one last time. I agreed. Her parents are very well aware about all the above things; I never lied to her parents about anything. Now, I did a mistake in between, by coming back to Chennai from Bangalore on her request and of course my interest too. But I clearly told her that I’m not going to stay in her house and I will stay separately in a PG. but she insisted me to stay there. I was clear about not staying in her home. , but unfortunately I met with an accident while on my way to Chennai and was not in a position to walk for 20+ days …. So she had me stay with her parents and her for 3 months… I was not feeling comfortable, and tried to move to PG , but by that time she received a lawyer notice stating she had to make payments to the Bank around Rs40,000 immediately, I felt sad and took her problem as priority and arranged some money for this ( this wasn’t the first time I’m helping her with money related things) and so I did not move to PG, I did not have an option. But in the month of April I finally managed to move out of their house... Now, my mistake is that I did not inform my parents about the relocation because if I did they surely will oppose and not allow me to go back to Chennai. The girl, her mother, her sister , her brother-in-law , all of them were aware of entire situation except for her father , they always kept her father in Dark side, never told him anything… Now, I recently again went and spoke to my parents about her trying to convince them... But this time my father & mother made it crystal clear that they will not allow and if I go against them it will affect them very badly. My parents spoke very openly to me this time and told me how they had to suffer for me and that my father’s heart is weak. I felt very bad and I came and told her and her family about the situation. They at once got angry and asked me one close ended question, “Are you going to marry her if your parents doesn’t agree or no ? I said I cannot do this at the stake of my father‘s life. Then they asked me if this was the case why didn't I tell them? I told them all these were the things that they were aware of and i have not lied to them.. And they are asking where did my senses go when i had to stay there in their home with them, I asked them the same too, i told them i didn't wanted to stay, you all forced me to stay there.. and I took the Girls & their financial responsibility keeping my own problems aside.. and more over I also asked them where did their senses go being so elder and matured than me, to make me stay in thier home without having to speak to my parents once.?? I strongly feel this was all part of their plan to trap me in this and to make sure there is no way out And after that they started to threaten me, blackmail me stating I have to marry her because I finished staying in their house with all of them. I thought of ending my life as I felt I was cornered and somehow they understood it, so her mother asked me to take her to my parents… I immediately booked tickets hoping that at least if I take her, she will understand …. My parents met and decently said NO to this and left.. She threatened me to marry her daughter and said I finished staying in her house and that I have to marry her. I don’t know if this is planned by them, but she took some overdose of Citrizen tablet ( for Cold and Head ache ) and got admitted in the hospital. I went there knowing there is a threat to my life.. I didn’t care, because my intentions were honest.. So I went..!! Now again her mother and the Girl is threatening me and trying to wash my brain stating my father and mother will be alright even if I go against them. Honestly, I’m starting to hate her family and not to like her from past few months as they are very selfish, criminal/evil minded people…. Whenever they are having any arguments with somebody they first threaten that person , record the calls etc etc.. I have seen myself.. I don’t want to marry her and later suffer by losing my parents and not just that , their family is very cunning and smart, and she is somebody who keeps changing colours ( I cannot trust her completely )… What if I have to marry and everything becomes chaos and I have to divorce her.. it will even more bad than what it is now… please advise if they can go in legal any ways and how beneficial it is for them or me… Thank You R