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This is needed !! It's been needed for a long time and now more than ever it's required not only for V to know Sais struggles but for the audience to see what Sai went thru during the separation!!! Sais FBs are needed!!
See one thing virat misses in sai is that she easily gives him up. Look how pakhi holds on to him. He wants sai to fight for him, ask him questions like he did when he saw her with jaggy! He expects that kind of passion from her side. But he doesn’t understand that sai doesn’t trust his love for her. His actions towards other women masks his love for her.
So he will be very happy if she has breakdown or rips him apart for marrying pakhi! That’s what his monologue is after being unsuccessful in making her jealous. Does she not feel bad to see me with pakhi? I could not tolerate her with jaggy!! And she is unperturbed?!! This confuses him. That’s why he went so mad.
So any kind of outburst that shows her displeasure at him for marrying pakhi will give him needed clue that she still loves him.