Earlier RK hurt Madhu and hurt himself in bargain. If Madhu hurts RK she will breakdown much more than she did earlier. They say Weak people revenge strong people forgive and intelligent people ignore. Yes RK is weak mentally because of what he went through in life. He has every reason to be suspicious since he is not confident. Madhu on the other hand has handled herself well and emerged stronger. She should learn to forgive and make RK realize his mistakes by not ditching him but with love. I am waiting for CV's to handle this with utmost care. There wont be any difference left between RK and Madhu. She should only make RK realize so that he does not repeat his mistake that is the point not teaching him a lesson.
Her goal might be to finish RK emotionally but in the bargain she will be torn apart. People who are not used to hurting others suffer the wounds more than the person whom they hurt. She has to face RK's mother who stood by her through thick and thin and nurtured her wounds earlier. She can never forgive herself by hurting RK's mother. So i guess this is a positive track to make RK learn from his mistakes but she wont repeat the same.
Believe me if RK is going to be hurt then he will think Madhu is like Dipali. For Sultan's sake she left him that would be the interpretation. She is not going to prove a point here.