Blackmail

Dear sir, i am working in oman (gulf) i met with a girl she was girlfriend of a boy who is living near by my house he cheated that girl and that girl wants her money back from that boy because she has given some amount to him when he cheated her she wants her money back she asked me for help i helped her then we started talking continuously we become friends in 2015 i got a job in oman i called that girl she told me that she wants to marry me i told her its not possible because my relatives and neighbors knows about her relationship with her ex boyfriend that time she told me ok but after some day again she started forcing me to love with her every day she was asking to make love with her than i told her that if you want we can make love but i will never marry with you and you will never force me for marry with you that time she agreed after that we start talking daily and whenever she asked me for marriage i was saying the same thing i cant marry with you she said ok but i will love you forever now i am going to marry with another girl and i told her that i am going to marry now i cant talk to you she said no when you will get married han i will stop calling you even than i stop talking to her but last three day she starts blackmailing me with a policeman for marriage what should i do to whom should i complain for you kind information i never make any type of physical relationship please help me she will destroy my family repotation.