Nri law

Hii, I got married with an NRI on November 2016 in India and we got registered marriage too. He is working in USA.I went to USA with him in Jan 2017.He is on H1 B and i went on H4.Just after two days of our marriage(in India) I found him in a relationship with his office colleague ( he was having affair with this girl from some past years) I asked about her he always told she is my good frnd only but past pictures and msgs in his phone shows there is something between them.Many times I told him that it was your past don't be in contact with her anymore but he always lied me even if I saw msgs from her side to him he was like it was official chat but it was not.That girl lives just in front of our home in Us .All his mails before marriage used to come at that girls address i have pics of the same but before our marriage he told me he is living with roommates now don't know whats the truth.i blocked her from every social media used by my husband but they used to have conversation over official hangouts.People say and even my husband that he has a a boyfriend whom I had contacted several times on fb and her bf says I know everything what u r saying and further her bf says she will be sooner with me in California.i think they (my husband and that girl) are playing n showing off that boy as her bf but i got confused when I read one message by that girls bf in my husband phone saying to my husband that u very well know about me (girls bf) and her (the girl) then why did you do like that ( this message was done by girls bf to my husband before my marriage).Intresting thing is my husband is Ethical hacker so he knows how to create fake messages etc.At present I don't have any proof showing he cheated I have his past conversations with this girl and the gifts they shared.Everytime I asked him to leave that girl he started beating me he beated thrice in USA and once in India.He tortured me by making suicide attempts for three times in US by eating pills.His step sister got expired on July 2017 as she committed suicide by hanging herself and before also she attempted suicide 10 times.It shows commiting suicide is normal for them dont know.In india he made three cuts on wrist with blade.However I have audio recorded where he is confessing his mistakes to my mom like he beated me,he made suicide attempts but I don't have any proof showing he cheated except his past msgs with that girl.i was bearing all this after my marriage then in May 2017 I came to India.His parents and all are not picking up my parents call nor they ever asked me that why I am in India just in few months nor my husband is in contact with me I don't want to be with him anymore. How can I apply for divorce ...any benefit if I file divorce first from my side? Can he file divorce in USA?if he can apply in US will it be valid in India?? On what grounds I can apply for divorce?? If case applied in India,he will be asked to appear before court in India??