Sexual harassment

One man whom I had an affair with sent me my private act video on whatsapp, in the video he is talking to another guy it shows that he is showing that video to a third party on his laptop. He thinks I will get scared and offer him sexual favor and he wants to destroy my reputation He is a married man, he manipulated me by saying that his relationship with his wife is not good and he loves me a lot and I m his wife. We had a relationship for some years. During those years he made the video, he had a CCTV camera in the room and I trusted him. He said its not working. During our relationship I met his wife and through talks I came to know she is a good lady and really cares for him. Few days later they adopted a baby girl then on I decided I should back off, it's not right to be with a married man who's wife is so sweet and now he has a daughter. He started emotional drama threatened that he would kill himself, he really loves me, I told him I can't be with him and offered him friendship. He accepted, but off n on he sent me messages that he loves and also he demanded sexual favours. I did not let him manipulate me this time. When all this did not work he started abusing me, started sending me obscene vulgar videos. And now he is sending me a video of me and him engaged in a private act. What basis should I file a FIR ? Will he stop harassing me? Sex was consensual but the video was not. I was not aware he has it.