I got cheated by A girl and her famiy

It's 5 years Relationship, She is minor(Aged 14) when she proposed me (Aged 20) we were into relationship. And she told her parents about us when she is 15 years old. Her parents clearly Accepted our love and promised us to get married when she turns major. And now her father cames into picture , He always tell some problems saying you are my son in law and he takes money from me both In the form of online transfer and offline cash, I got to know he even promised some other guys to marry his daughter and same way he took gold and Money. All these money transcations are known to everyone in her family but not my family. Finally she is 18 years , She approached her parents but they denied to accept the proposal of marriage due to age factor. MAY 2019 onwards the Discussions are happening and her mother finally told if she gets married to me , girls mother gonna commit sucide. Now the girl started acting as per parents wish and left me. Upon going into deep Discussions between me and her father they decided to file case using high court lawyer. And threating me with politician names , I have clear voice recording about each and every talks from last 6 years with father...girl...mother! Her father wants to murder me which is recorded in voice. I'm fight against on point said by her father " Do whatever you can , but what ever my daughter says it's final " I need an advice please help me.