Extra marital affair by husband how to get divorce now

Hi. I am Revathy,26 years. I am married for 1.5 years. My husband's name is Vigneshwaran. Ours is a love and arranged marriage. We loved each other for 5 years. After few months of proposal i came to know that he is in contact with many other girls. We had many controversies regarding the same. Whenever I wanted to quit the relationship he would beg so much. So i retained. He even had indecent talks with his relative girl and when i asked the same drama continued. Still he dominated me so much. Whenever i wanted to go away he would use abusive words on parents and me. Being afraid of such talks i kept quiet. After marriage also this continued. I did not let any of our parents know about these issues. Now after my conception he is in relationship with a divorcee. She is his relative's friend. At one point the issue broke and our parents came to know about it. Only then I came to know that he had gone out of stations with him. I dont want to live with him as i fear our safety. Pls help.