Mental Torture by Wife

I have been married for last 13 years and having 2 kids at the age of 11 and 7 years. I am a service holder. We had a love marriage fighting with our family and then all agreed for the same. I just had a job however stayed in a rented flat as my father lost his business and all the properties in bank loan. From the initial days it was ok but fights were there between my mom and her as in the normal house. Somehow I didn't understand what to do. We have our first child after 2 years. And second one when our son was 3. Between this period my wife started staying at her paternal home as she didn't wish to stay with us due to differences of opinion mainly with my mom. She told she can come if I get separated from my parents. That time my brother was studying and I was the only earning. I tried convince her but she didn't agree. When my brother completed his study and got a job, then I took a separate flat Nd ask her to come. She Came and we started staying together with our first child. But in every week she stayed 3-4 days in her paternal house. Our physical relationship was also very irregular. Then we have our daughter, which was not actually planned. However my daughter is a darling to me. But when she got pregnant second time she went back to her paternal house and didn't come back even after delivery. Almost before admission to senior school of my daughter she returned to my flat. Now suddenly she is telling that she wants divorce. As per her I am a selfish man and have not given her anything. However for last almost 1 year we are fighting and I don't find any proper reason. Each time she speaks about the old days when my earning was not sufficiently enough and I couldn't give her costly gifts, and the words with my mother and all...now she is 36 and says that she will do job and will not stay with me and even will not fight to to get the custody of the children. For almost last 6 months she doesn't speak to me properly neither we had any conjugal life, and always talks to me very rudely and curse me and shouts at me in front of the daughter and son. She has also told her parents that she she will not stay with me. She had taken admission to ICA and even didn't tell me and it is funded by the uncle of her, whioI came to know later. Now she says that until she gets job she is staying with me in return she cooking for me and for the children. All the time she busy with her phone and If try to say something she gets furious and starts humiliating me and says she has no feelings for me. I spoke to my in laws, they say, she has fought with them also for the same reason. I am actually clueless what to do and very much frustrated. I did so many things for the family, getting separated from my parents, bought a flat in joint name with my wife only, also bought a car, children are in good achy, good food, buying medicine for my diabetic wife...but still She never become happy now she is desperate to take divorce. I am clueless mentally devastated???