If i have to pay huge alimony if my wife proves I am having affair

I and wife dated for an year and now married for 4 years. It was late marriage . She 40 and me 46 now with no kids .Both in high reputed job.. Initial 1-2 years were ok later we started having lots of differences . We tried working out on our differences and make our marriage work. But it did not work.. Last year Met a nice lady and have fallen in love with her. I am in relationship with her from last 1 year . My wife left home after an argument 6 month back and is staying in her parents place. I did not persue her much this time to come back as I want to divorce her and marry again. I applied for divorce and wanted to go for mutual. She agreed for mutual but asking for huge alimony .She says i am applying for divorce as i have affair. She is hell bent on proving that i have affair hence divorcing and making it a point to ask for huge alimony .I am not in contact with other lady since one month as my wife is tracking my whatsapp .. call history and my phone to prove i have affair.. I have asked the other lady to stop contacting me untill i resolve my divorce issue as i don't want her name to be dragged in the case and make things complicated I don't want to give huge compensation my wife is asking for as we do not have kids .She has her own startup company and i am sure she will remarry too. Will my wife can put a criminal case against me for cheating her and make it a reason for high alimony ask?/What should be my next step ??