Do'nt u think that from Day one Nimmo & Kunal's characters have sketched in such a pattern that portrays there oneness.As if god has chosen them to be each other's life partners.It's only because of two reasons that they r not together-
1.Natasha confusion.
2.They were never given privacy as other married people enjoy it.This is a very imp factor of their seperation.From day one some or the other would always interfere be it kanta ben,Natasha,dadaji