harassment and blackmail and threatening by a guy

I was friend with a boy, who was also my colleague, in meantime we became close and spent time together either at his or mine home or outside. I am muslim and he is hindu we knew there is no future. Slowly, when my marriage proposals came for me I liked a guy and wanted to settle with him. I said my ex that i will marry someone my family selects and he was ok. But when he got to know I am with someone, he dragged me to do virginity test and then ask to be physical with him, which never happened when we were together. I tried to explain him, as he was my best friend, he then took pics of me while sleeping to blackmail, still I thought he is hurt so I ignored, he then asked me to be his friend I tried thinking past relationship and unfortunately we were working on same project so couldn't leave. I informed my family also half of the things. He then became abusive and tried to molest me many times and act all guilty and said sorry. Used to come near my office and threaten me.