How to get divorce

I got married in October 2016. I was in love with a girl before marriage. Due to family constraints I have got married to another girl. (she is aware of this before marriage. Since, I have promised her that I would forget my lover and live with this girl, she accepted to marry me). However after 4 months of marital life, I have realized that I cannot live with any other girl other than the girl I am in love with. So, I have decided to make my wife clear about this and I told her that I still love her and I can't live with anyone except her. My wife left my place in March 2017. Though my mother tried to convince her to give it some time, she and her parents were reluctant to let her stay. Both her and her parents are aware of my love matter before marriage itself. My mom is the only person who is not aware of this. We are not staying together since 10 months. She is at US now and I am in India. Please suggest how to proceed for divorce. I have not taken single penny as dowry from her. In fact I have shared marriage expenses. She is not ready to give divorce on mutual consent. To the best of my knowledge she is not ready to give divorce at all. But I badly want to get separated. Please suggest how to proceed further.