How to got divorce from my wife

Hi there, I married before Six year. From the day one of my marriage my wife used to fight with me as we have very less understanding between us. Gradually my wife have started doubting & blaming on me about my extra-marital affairs. she always tried to humiliated me, my parents and our reputation in society. after 5 year 10 months of my marriage, my wife went to her parent's home for staying; from there also she used to do doubts and all the things. Than i have decided to not to bring her back into my life as we are never going to live a happy life together. So from last 16 months she is living at her parents home. During this time our society take action for re happy life me and my wife. she come my home for 1 day (may-18) and she threatening me she never divorce me and not to come my home staying . After than, when i asked for divorce than she refused for the same and she threatening me she never divorce me and not to come my home staying . in between my marriage life i have got 2 child , 1st is girl (5 year) who staying with me and another one is Boy(2 year) who staying with them Now i want to move ahead in my life so, How can I get DIVORCE from my wife?? Please help me through this. Thanks.