My wife wants divorce i have child i have 90 % doubt she affaired

We were happy last june2016 but suddenly she went to herhome .and she asked to givedivorce without no reason ,she left to pick my phone and whatsapp chat ..and she was online in whatsapp..suddenly i got the post paid bill and bill was too much high .den i found a number jispe meri wife recently baat kar rhi thi 1 month se wo bhi ladka uski city ka hi hai and he was also divorce ,,roj din me 5 baar baat hoti thi ,den asked to my wife jab main apni wife ke ghar me gya then they are illitrate she refused ki maine koi phone ni kiya .meri saas to mujhe ni manti kyunki meri love marriage hai or uska husband bhi usse alag rhta hai ,or mera 2 years ka beta bhi hai ,wo milne bhi ni dete ,suddenly wo abhi november me apni mumi ke sath idhar se samaan uthane aye and they thretened ki hum koi hungama krenge tb humne police ko bulaya or saman de diya .but main use divorce ni dena chahta main unke sath rhna chahta hu .kyunki mere bete ki jindgi brbaad ho jaegi she has no income .may be she want to live with sumone else ,bcoz she is 24 and i m 29 .den tell me how can i settle the life and protect my son future please sir .police councellling kar chuki hai but the gave the stupid reason .and all said her mother is not good she is spoiling her girl life