Okay im a SulBala fan but im going to comment keeping all my shipping aside...
Even without Sultan in the scene, im sure Madhu would have forgiven him, but I know she will never go back to him...
Like Cutieee said, i know she loves RK but not the same way anymore... She can forgive Rk, but forgetting everything is an impossoble task...
As for RK, repenting and redeeming himself is a huge task... Seriously if he ever change and ask for forgiveness, he will rise in my eyes... But Madhu going back, its just not right...
Unfortunately, i cannot see Rk repenting... He is just driven by the fact that Madhu moved on... But honestly tell me, did she?? But thats what Rk feels... He is not feeling jealous because of love, but his EGO...
ps: this is strictly my pov and ill just say again that this will be my opinion on the track if Sultan was not even in the picture...