Consider, Purab has grown up with Abhi as his bhai jaisa dost. He feels close enough to Abhi to call him Bhai because of what they shared as children. He has a chacha chachi and cousin sisters, but he is much closer to Abhi's pariwar. Essentially, Purab has no close family ties, but he found a surrogate family with Abhi & his relatives.
Normally I would say that you don't have to be blood-related to people to have deep family feeling for them, but I think the CVs are showing that whatever the strength of Purab's friendship with Abhi or love for Bulbul, at the end of the day he is not connected to anyone by that "ultimate family feeling." He will not understand how fiercely someone can make a sacrifice on this basis, and he has no one to make such a sacrifice for him. Instead, he is an individual caught in the web of competing family relationships, and he cannot win because he is all alone.
This is why Purab doesn't and couldn't possibly understand:
- that for Bulbul, her romantic love/attraction for him could never be important than her responsibilities to her family, and especially her concern for her Di
- that for Abhi, his walking away from Aaliya twice would be a big enough betrayal to eliminate the special brother-like bond between them
- that for Pragya, her mother's health and peace of mind matter more than her personal happiness and integrity, which is why she chose to keep up the lie of her marriage to Abhi from day 1
I think it's really sad actually that the story falls back on the traditional idea of family-as-defined-by-blood; by using Purab this way, the CVs are showing us that orphans can not have "real" families, that their feelings and needs are less important than the bonds between family members. It's an old-fashioned idea that I think really is the powerful, encompassing, not-so-hidden undercurrent to the story.
Purab was not wrong to look out for his own self-interest. For him, walking away from Aaliya was the rational, reasonable thing to do, as well as matching what his heart wanted. But he quite simply doesn't stand a chance of getting what he wants or deserves; his needs as an individual don't match up to the obligation Olympics that bind Bulbul, Pragya, and Abhi to their family commitments.
Ultimately, a daily soap like this serves to reinforce prevailing values. Purab's position as the outsider and orphan will always block his way to happiness, because in traditional values, happiness belongs to families, not individuals.