Leaving seperate from 3 years

I had left my husband's home and staying with my parents from 3 years..my husband used to visit me here once a year..i had told him and his family that i am having problems with his behaviour as we doesnt talk for months..we lived like roomates for 3 years in which he was out of india most of the times..we dont share anything..we never smiled together..in starting 2 year he did not say anything never asked me why i am living with my parents..but from this year starting he has started asking me to come back in rude voice..he has always talked like that..but i dont want to live the same life again and want a divorce now..earlier i hoped that he will change ..but now i know he can never change..now he also feels the same..earlier he always said everything is perfect and never responded to any of my problems..he is earning more than 1 lakh per month..totally we have a six years of marriage..so how much alimony i can claim and on what grounds i should apply the divorce..and yes we dont have Kids