Need help on 2 cases filed by my wife against me for no fault of mine.

I am married for 20 years. I was abroad and my inlaws cheated on me by fooling my widowed mother and getting me married to their mentally ill daughter. After marriage i was not sure what her problem was as i never had an affair to know a women and her behavior was weird until i came to know that she is suffering from psychic issues which were never told to us. I treated her and things were fine. Eventually we settled down in India stayed for a few years together and in 2017 we started to live separately, We have 2 daughter if the marriage. She comes from a very wealthy family and me from a middle class house. In 2021 Dec she filed 2 cases against me one is a divorce petition and the other a DV case demanding unaffordable amounts of money. I have certificate ( evaluation) and prescriptions from a psychiatrist to prove her mental ailments, Can i file a cheating case against them as they have taken due advantage of a middle class family and misused the power or money.