I want a divorce

Hi. M now married to a girl under special marriage act. It's been 2 years. We were in a relationship for 3years She was already married before marrying me and had a kid. From the beginning the blackmail started. For marrying me she blackmailed me u have to marry me or I will go to the police and put u and ur family behind the bars. And threaten me that she will commit suicide .u can see several cut marks on her neck and hands.She made it impossible she married me in court without getting a divorce from. Her husband. Then after her divorce she asked me to marry her again. Not asked me actually forced me to. She is Christian by religion and m Hindu.she has made my life miserable.she hits me abuses me and when she married me she gave a false information in the marriage license. Instead of writing there divorcee she wrote single.both the times she got married to me.she had made my life miserable.my family doesn't know about it yet I'm staying with her.kindly tell me can I get a divorce on these grounds.