Divorce petition on the basis of mental cruelty

I was in an emotional breakdown after a breakup and ended up drinking. This girl started talking to me and wanted to marry me because she liked me. I was not thinking much that time when wanted to marry me because her parents were trying to marry her to someone. We decided to elope and got married within 4 days. This happened in 2007. Since the day of marriage I was mentally abused by my Mother in law and my wife always took her side. We didn't consummate our marriage for 4 years after which the family members talked to my wife and I was served as a baby making machine. I never took any money as dowry or gift from my in laws. She used to stay with her parents and refused to live with me. Again the family intervened and she came to have another baby as the family thought having a baby will solve all issues. But it continued. The first is 11 years old and the second is 5 years old. For the last 4 years we live in the same house but not as husband and wife. Everytime a disagreement arises she will demand for divorce. I hesitated due to my youngest son who was a new born. During this 4 years I had gone through repeated cycles of depression and suicidal thoughts and attempted suicide too due to constant fights and disrespect from my wife and her mother who complained about my salary and lack of funds/ property in my name.i had never stopped taking care of my kids and they both can't live with me. I started to drink heavily and come home and sleep to avoid confrontations. I was suffering from insomnia and High BP. I started to have casual dates and I met ex when I went to india. And my wife took my phone and saw the picture of me with my ex and sent those pictures to my family member and my colleagues and then demanded for divorce. She threw my belongings and me out of the house and kept calling me frequently during work and at night threatening me with suicide and she'll poison both my sons. Because of the frequent calls during office hours, my reputation at my work place became bad and I had to resign. She started saying I have to repay her mother's money . The only time I took from family was when my car had an accident and I paid the amount every month in installments with interest. The mother in law send me very abusive texts and asked me give divorce I accepted my faults but I didn't want to continue with this marriage. She keeps threatening me saying she will file a case of dowry and domestic violence. She will harass my ex. Suddenly she refused to go for mutual divorce. My sons are already affected much because of her constant fights in front of them. She is very abusive verbally to the eldest son too. He doesn't want to stay with her. What should i do? Can I apply for contested divorce?