Wife having affair with another married man

Hello! I'm Indian but USA citizen. I have been married for last 18years. My wife is a homemaker, she returned back to India after I came to know that she is having affair with another married man who was her classmate in school days., I tried to compromise for the sake of my two kids as anyone can get diverted in married life for some reason. So I requested her and asked her to start fresh life. Instead she put multiple cases on me and demanding huge money as kids are in her custody from India to USA court. If I don't pay her, she has requested to imprisonment in USA jail. It was too expensive to run case in USA so i returned back to India. Found a small job in Bangalore . And made a rented house near by my apartment where my kids live with her. Thinking that my kids will meet me. But she never allowed to me to come to home nor allowed me meet my kids (18yrs old daughter and 10 yrs old son ). I have filed case on her in Indian law and requesting kids custody as I don't want my kids to live with her as she is living with some guy. I don't know what to do as She occupied my apartment and now demanding site which is on my name and demanding 2cr keeping kids in her custody. Plz someone guide me what should I do. If I give away everything what is left for my living..