Okay so the original name of the show was meant to be Kathputli meaning someone is directing and playing with another person's life for whatever reason. My strange prediction is that RK wants Madhu to turn into him? He wants her to feel the pain of betrayal like he has. To see what it is like to have all the fame, money in the world but not to have true love. How one betrayal can turn you away from all your loved ones? Madhu slapped RK for driving around drunk in the middle of the night. She thought he was being careless because he thought he was indomitable super star RK but he wants her to see that it was his depressed state that made him act the way he acted. That you can jump to conclusions about someone so soon.
I don't know if this makes sense I am just trying to make sense out of the promo. This would explain why he tried so hard to earn her trust and move heaven and earth for her before breaking her heart. He fought her biggest villain for her and did everything to keep her family happy. That is the same emotion he went through when his father committed suicide. He had all the trust in the world in his father but it became breaking down after he took his life. He just didnt want to punish her in a way that would make her suffer but make her understand.
I still think revenge coming from RK at this stage is a very unrealistic and unnatural but I am trying to make sense out of it by putting myself in RK's shoes and thinking what would be his thinking behind it even after everything him and Madhu went through together. There are still many things that make sense Madhu was the one person he had in the world because his family didn't get a long with him so well and Bittuji is his secretary not friend.