I want divorce but wife is threatening and denying.

I got married in 2017, it was a love marriage though we were not the first choices for each other and got married under her pressure of age(30 then). Things were pretty messed since beginning, as she was staying wd my parents and I was posted away for sometime, she didn't gel up well wd my family and there were arguments and fights everyday. She is working too but still there will be fights over buying grocery with HER Money while I give my mother allowance for household. Things like this kept in going and I kept trying to cope up and manage the situation well so there can be peace in house. She would constantly insult and humiliate me infront of the extended family members and her friends. There will always be arguments and fights whenever we were alone (we stayed wd my parey). She would leave the house over arguments for days and stay wd her sisters. It went to an extent where we started talking about getting seperated ( I have chats wd her confirming to this) and how she doesn't wants to do this and she will give a last chance to the relationship. In the meanwhile I met someone who made me feel supported and good enuf in life. As I was already discussing seperation, I felt It would be okay to stay happy where I find happiness and motivation for life (maybe I should have waited till it ended). This is a time where she had left the house and haven't been back for around a month, then one day she came back. I told her bout everything and asked her to get divorced so we both can live happily. She talked me into it and took details, and then denied seperation. Then she told me she is pregnant for 4 months. Then she started blackmailing in name of the child and denied divorce saying she will not let me start life wd anyone else !! Now she is threatening me that she has proofs of extramarital affair and that she will ruin my career and respect, also she will drag and involve the girl's family in this. This has been going on for over a year now and I am staying alone and away from 5 months. This marriage was over long ago, now it's just a namesake and she agrees to this too, but says go live-in or do watevr but I won't give divorce, so u can never have a happy life. I have been requesting for MCD, but she is constantly denying and threatening me. Kindly suggest what can be done, as I can't involve anyone's family in this matter and end this soon. I can't take more of the pressure and oppression.