Cheated by boyfriend after Tilak function

My Best friend of 3 years proposed me on 14th December 2019. I said yes to him in February 2020 or March 2020. And after that our relationship was good untill August 2020. When I found out that he did sex with a girl whom he met 15 days back. And I decided to move out of relationships. I talked to that girl and asked her if she wants to marry him as they have come in physical relationship. She said she didn't know about me (His girlfriend and to be wife) and she doesn't wish to marry him as he loves me. He convinced me that this was the last time and give him a chance to prove himself. I trusted him. In 2021 also I have seen him chatting or call logs with that girl. In 2022 he asked me to marry him. In May 2022 our families met. (His Mom, Dad, Jiju) Did tilak function at my home. And in July 2022 I found him sexting with a girl on insta, sharing his nudes, talking vulgar things. I confronted him. And was not talking to him untill August 2022. When I came to know that he got admitted. I have been there with him throughout the day. Fed him. Helped him. And the day when he got discharged, 3 days after that he again started hanging out with the girl. Meanwhile I came to know even after our tilak function he went out with her at Lonavala and had sex. He has confessed the same. And got few proofs of it. After this incident I left him, but he again keep on convincing me and made me fall in his emotional trap. I decided to give him chance again. But in October 2022 he didn't stand by me after the death of my grandfather and this hurted me the most. After my grandfatherS death I didn't talk to him for a month. He again convinced me and In November U gave him time till May 2023 to prove he has changed. After that we got intimate twice. And on the very next day he was saying I'm not interested in you. I don't love you or trust you the way I used to. I don't think this relationship can work out. If u want you can marry me in 2 months or else I will marry someone else. I asked him to give me some time to mourn on the death of my grandfather. And to accept that you have cheated on me. He kept on pressurising me. Untill one day, when he said i dont have guilt of what I have done with you, If u want we can marry but don't keep any expectations from me, I used to go to sluts and used to do sex. What you can do?. I have our photos. Keep that in my mind. And tell your mom to call my father and tell him that you don't want to marry me. Out of fear of leaking my photos I told my mom that he cheated. We were talking on sms, and recently I came to know when he was doing all these things he got engaged/tilak function with other girl. And this girl is not the one with whom he had sexual relationship or casual relationship. Our engagement was supposed to be in 2023. I have lost my mental & physical health due to this. I missed my CA attempt, got many physical changes in my body due to hypertension. My mom called him and his parents to meet. But he didn't show up.