Bf refuses to marry when family involves

I was in relationship with my bf from 1 year he promised that he will marry me and we involved our family . I am a brahmin and he is baniya ..he told me that his family is chill and modern and they will get convinced and then he told his mom and sisters , her mom was little convinced with intercast 7months back only then he made me beleive everything goes well then i involved my family keeping my respect at stake as i never did such relationship things before and very sincere. After my parents involve , her mom demanded girls side should call first and demands started . My father talked to her . Then her mom when girls parents say only then will bring our boy to meet for a meeting . I convinced my father for that too . Her mom and susters , brother in law came , no father he has . All talked will do marry and all .we paid the bill and bring sweets everything When i came hes saying my mom said the girl didn’t touched feet .He made me said sorry to her for that and i did . But still then she said to him this is intercaste i cannot marry which she knew 7 months back . The guy had no spine to take stand and step back . I am devastated and my family insulted . He roamed with me giving all promises and took pictures . Pls tell me how to do police complaint For this fraud , otherwise they will do like this with other girls too.