I want to divorce my characterless wife who indulge in adultery

3 years ago I have a girlfriend who belongs to my family relatives. In the starting time of our relationship I don't recognize her intention that she and her family members are fabricating a honey trap. Because I am a government servant and well settled but the girl is 8th fail and belongs to poor family. Five month ago I broke up with her and When my marriage fixed with a working woman than my girlfriend and her family approached to Mahila thana and threatened if I don't marry the girl they lodge a complaint under section 376 and take the matter into the media. After such circumstances I had to get married with her in Aarya Samaj. And in this period my father BEDAKHAL me to protect my family. So I reside in rented room with her after bedakhali. After two months of marriage I got to know by call recordings that she has a affair with her brother-in-law. I want to divorce her but I have only proof of call recording which I obtained from phone hacking. What should I do