my wife want divorce from me because she got records of my past chat history with my girl friend. af

my wife want divorce from me because she got records of my past chat history with my girl friend. after marriage, i chatted with my girlfriend for a week when my wife was not there. i hv told my girl friend that this is the last time im chatting, after this i will see u as a friend only. she has suicide tendency if i behave badly with her or show more love towards my wife. so it took time for me to avoid her completely. so i never tell her that my family life is happy. my intention was to avoid my girl friend (she is my relative too) without knowledge of anyone including my wife. but thru police help, she got my past chat history which includes vulgar talk, most of them was talked before marriage. but i never had sex with my girlfriend, but my wife is assuming that i might have had it. by reading my sms she guess many wrong things. interesting thing is i live in gujarat and my old girl friend lives in kerala. we had mental relation thru phone only. My girl friend is also married and having a kid also. if my wife file case against me, my old girl friend will be dragged to court.,her family life will be spoiled, her husband may seek divorce from her, her son's life will be spoiled. thinking of all these things, i thought of handling and solving my old affair on my own. but my intentions are misinterpreted and now im in trouble. i love my wife a lot. i cant live without her. but my wife's parents brainwash her and are trying for divorce saying this reason. they want a mutual consent divorce which i dont want. but if i dont agree for mutual divorce, they will go ahead and file a case against me. please advice me what will the result of this case? Is there any loop hole for me to prove my innocence