Actually RKB has always been like that. People he loves and cares for, he'll go to any lengths for them. Remember how he prevented Mihir's arrest during the MMS track. And where Adi is concerned the guy has a blind spot. That's his Achille's heel. So it's not that he can do no wrong.
But with his attitude he's just shown Ishita that their relationship is not as strong as she believes it to be. He still has issues where trusting people is concerned. He's still gullible to Shagun's antics, buying any and everything that she throws his way.
But then this is where YHM is also like any other dharawaik, where the guy will always fall short and the female lead does everything the right way.
Let's see how RKB wins Ishita back after all this. The track just needs to be ended soon!!!!