How to get protection against threats from Ex Girlfriend

there a is one girl both we are close friend both family's are knew it but her family was not ready to marry with me. then she get away 4 times anywhere then her family and me look up and bring each time. after that her family did her marriage with another boy but she left her husband after 1 week and came her, her home with parent's.till now she get away anywhere and then her family threat very badly with my family and me because her family has power like money and reputation etc.i was doing everything as it is like they want from my side . now i am in mentally disturb and my family also what i do? i need protection if she attempt suicide,and her family will going to kill her because she want me or death.