Divorce

I am the husband , i got married on 15th January 2019 in Jaipur , Rajasthan. I want to file a divorce because my wife humiliates me and my parents alot in front of everyone (relatives , neighbours , friends , etc. ) I am living away from my parents and wife since 2 months in same city because i can not live with her in such a bad environment but i keep visiting them in few days. I was in a relationship before my marriage and i told this to my wife , but then she started doubting me for being in an extra martial affair , my wife and her family started calling my ex gf and her parents and blackmailing them by showing our old pictures ( my pictures with my ex gf) My ex gf's father clearly said they are old pictures and now we are not in touch any more but my wife is continuously trying to drag my ex gf in between. She is blackmailing me and my family that if i filed a divorce then she will file a fake dowry case against our family and she will drag me into adultery case with my ex gf. We spent 45lakhs in marriage and we have all the bills on our name whereas my wife's father gave us 7 lakh in cash to use it in our own way. We are ready to return their invested amount of money. My family tried to solve the issues within our family so my wife's family visited us and asked me to try for one more month if our marriage can work out , i tried but i couldn't live with her anymore plus she abuse my parents and my parents too does not want to live with her but she is not at all ready to leave the house. I have a letter in which i clearly mentioned that i am not asking for dowry , there is nothing doing which money , the only reason i can not live with her is her nature. THIS LETTER HAS BEEN SIGNED BY ME , MY FATHER-IN-LAW AND A EYE WITNESS. what can i do to file a divorce? Please help. She is currently living with my parents at my home and humiliating them in front of everyone.