Living seperately for 3 and half years.

Iam kavitha aged 26, from chennai and got married on [deleted] and due to family problems i came to my moms house and living seperately from 15-1-2013 till date. i lived with my husband for just 4 months and after that my husband forced me for divorce which i refused to give, so he threatened me that he will be in live-in-relationship with other girl and i cannot do anything on that. Mean while after an year many in my family told me to divorce him because they heard they he in living with another girl. I did not believe it and was still waiting for him, few months before only came to know that he has a kid which he posed in facebook.Then i called him and came to know that i am not his first wife and he is laughing which completely broke me. Now there is no point in waiting for him. Now only i realized that i should not have waited for him and he does not deserve it So now i asked him for divorce he said that when i asked for divorce before 2 yrs you did not accept ,now why should i accept and am settled you cannot do anything... so i won't give divorce like that he is saying.. How can i get divorce from him? I dont not want any compensation or anything . just divorce.. Need your suggestion to get divorce from him.