Cheating

I was in relationship with one person for last two years. I promised to marry him. I loved him truly. I told to my family about us and they enquired about that person and they came to know about his worst character. Later his friends contacted me via phone and told about him that he is not true to you and he loves you only for your money and family business. Later i realized it by his behaviour. He beaten me many times in public where every one saw it. Now I'm trying to come out from his relationship but he blackmail me with my photos and forcing me to marry him. He speaks wrong about all caste except his caste. Now he is saying that I'm not accepting him because of his caste, but it's not true I know his caste while loving him and then I loved him truly for 2years. Now he is collecting all my relations and friends number and speaking to them about me and my family. If they are not responding to him then he keeps on calling them, till they speak to him. I don't know what to do ? Please help me.