What struck me today was that Raghav agreed too quickly for the engagement.
This is Raghav Rao playing some tricks, as per my understanding.
Kirti is being emotionally daft and he knows that she won't hear any voice of reason so what does he do? He plays the game better. He'll agree to the engagement, then just wait and watch.
This man is up to no good. It won't be the first time for him to use twisted ways of getting people out of mucky situations, especially when it's concerning his sis.
He will not divulge all this to Pallavi because he knows she will object.
It's a hunch, this guy, up to no good, because Raghav Rao is a shrewd and manipulative man. Don't get carried away by his soft side. He can be extremely ruthless.