I had physical relationship without attachments with someone and now they are harassing me

As I have mentioned, it was purely physical, for fun, the guy wanted nothing out of it and me neither. After I told him I had feelings for someone else, he said he wanted to marry me. I told him no. He did not take it well. He involved his parents and my parents. I tried explaining to him that I do not like him. I thought verbal communication will suffice. I told his mom too that I am not interested in him so I do not wish to give him a chance. His mother had asked me to come and end things cordially on 29th of February. I did. I went there to solve things. He wanted to spend the night. He forced me to stay as I was leaving. His mother said "Khana khake Jao" and I told her no I am late. He broke a glass in front of me and told me not to leave. I still managed to get out, he lifted me and took me in. There is a cctv footage for that. I had an anxiety and a panic attack and I did puke there. He even tasted my puke which is gross. After that, to avoid his mental breakdowns, I started meeting him whenever he wanted. Told him I liked someone else. That did not sit well with him. I tried to show that I am a friend to just avoid the drama but I can't. As soon as he knew I was considering dating someone else. he threatened me saying he will come to my office or my house. I said okay. He said he will contact my parents. I said okay. I am feeling suicidal because of the constant threats and I need to get rid of him. I am not able to sleep, barely able to eat, my family is not aware and my dad has already said you brought this situation on yourself to you handle it. What do I do?