Annulment of Marriage

Hi, I has been in relation with my colleague from last 6 years.On the promise he will marry me we had physical relation for 5yrs.we stayed tighter for 3 months in UK. every time he used to say my dad health is not good to discuss about our marriage but you don't worry mom dad will agree soon .. his dad expired n we came to India. again when I asked him then he refused and said if I marry you then society will boycott his family and no one will marry my younger brother. I filed complaint against him in near police station n then he got ready for marriage on one condition that we can't stay together and have to keep secret for few months until his younger brother get married. We agreed n me my family and his friends went to temple and got married.(I have notarized certificate of marriage) Now after 3 months he sent(Annulment of marriage ) sec hindu marriage act 12(1)c through family court where is mentioned "he never had physical relation and one sided love from her and we were just friends. She blackmail and threatened me ,so I married". His age is 30+.please help me how to fight for this. I blindly trusted him and he continuously cheated on me. He spoiled my life and carrier. everyone knows that we were in relation and now got married. But suddenly this action shocked me and my family. Please help.