Beautifully expressed and the character analysis is just perfect!
I guess the urge for revenge was older than the sudden surge of love in his life. And in the ensuing race the former won. His experience with love is quite new and still nascent unlike the revenge that he nurtured since he was 12 (ironic that he met the love of his life at the same age!)
Yes, he could have been well-mannered enough to call Kalpi and say,"Sorry, I can't go through with it. The wedding is off!" Even a text message would have sufficed. At least they wouldn't have been gobsmacked like this. And, I felt, Kalpi's anger and pain were more for her parents than for herself as somewhere deep down, she may have been expecting rejection.
Well, had Raghav been decent enough to do that, it might not have caught the eye balls..or so the cvs think. The great Bard once said, "The surprise is the thing to catch the conscience of the king," in an entirely different context. And, the cvs have followed it vaguely in spirit. Where would the dhamaka, the shock, the unrestrained sorrow and anger come from if not from this?
I'm sure, if we are honest with ourselves, we were expecting some sort of separation between the lovers and some big role that Paakhi was likely to play in all this...just not this and in this way.
What is left to ponder on is how ;long this revenge marriage will continue and what exactly does Raghav have in mind. What is worrisome, however, is that Raghav may have underestimated Kalpi and overestimated his own capabilities. His own weaknesses and his lack of a complete understanding of Kalpi might just turn the tables on himself.