I am not trying to justify RK here as what he did was pathetic especially when the opposite person has loved you unconditionally. But then for me Sultan just does not come into picture. Madhu was and is still in love with only RK. RK might not even know why he is doing certain things but Madhu knows and understands him. Why else the very next day after the revenge drama she asks Bittujee to go back to RK as RK will need Bittujee the most now? Because she is in love with him. She was never jealous of Dips because she knows somewhere that RK had loved only her. When the love is so pure from her side and the opposite person is also asking for another chance, why not? True love deserves that.
coming to Sultan, didn't he have a loving wife from his flashbacks? Why didn't he change then for her? And rying Aryan if Madhu can come and rescue Aryan from there couldn't any of the goons got there earlier? Is that how you treat the most precious person in your life? And lastlty, we have all seen what happens when you keep love interest with gangsters. Monica Bedi is a case in point.