False promise of marriage

Hi, I was in a relationship with a boy who promised to marry me and we were into a complete relation.We have known. Each other since jan 2016 and for past 5-6 months i have been mostly staying at his place. Initially he also forced me to allow making our videos which i refused but thn he said emotional things like i dont trust him and all on which i agreed and let him make it when were a bit drunk (i dont know if he still has those in his laptop). He also told me that for our marriage he has to buy alot of things and not yet ready. He took me with him to see flats and a car. Asked me if i wud takelaon for car as it wud be discounted which later was cancelled. He made me buy all dowry items in the name marriage like fridge, washing machine clothes and recently a mobile. He even made me pay for his tickets for going home saying that he is going home to talk about our marriage but later started fighting with me for no reasons and said he wants to break up. Thn he lied that he is going to hydrabad to meet his friends from usa and i found out that he went to be with a girl he has been flirting with and ditching me with. He visited my relatives and family and promised them of marriage. His society people know me and now he is avoiding mine and my family calls as he is staying with this girl for past 4 days. I feel fooled and emotionally, mentally, physically and financially used and abused. His uncle is an MLA and sister is a big lawyer is what he told me and indirectly had threatened me with. Please tell me what actions can i take against him.