On what grounds divorce can be granted

I am 34 years old and my wife is also 34 years old. We got married in 2014 and we have one baby boy within in a year of our marriage. I am working with a small private firm. Just after having baby she left me on the basis of delivery of her baby and her medical condition during pregnancy since then she is living with her parents in her hometown and I am with my parents in my place of earning i.e. hometown. It 's been more than 3 years of our marriage out of which she lived with me only for 6-7 months even that too in installments of 2 months maximum in a row. Since then I called her multiple time to come back to our house and even went to her hometown to bring her back but it's of no use I always came back to my house empty hands and every time she make an excuse for not coming back and even after having meeting with her parents too they don't want to send her daughter and even she is not interested to come back and even she don't want to leave me and not ready to give me a divorce legally and it's like a mental torture for me to live like this she destroyed my life completely mentally and socially both. Since then I was in a continuous talk with her from my end over the phone to get my married life back by different ways of communication but even she is not interested in that as she is interested to communicate with me through phone or by any other modes of communication as well all I want her to come back but every time she said the same thing that she will come back only if her terms and conditions will be fulfilled otherwise she will not come and even she will not leave me. In this case what to do from my end what's the best solution you can suggest me to help me out to get out of this situation which is ruining my health mentally and physically along with my old parents as well. Please guide me through the best possible way to get rid of this case.