Maybe bcoz the target audience of Hindi tv shows is still that generation that believes in the line that ek ladka ek ladki kabhi dost nahi ho sakte.
It would have been awesome to keep Nishant-Mishti as real life people, real life where we have some friends from the opposite sex too and it's platonic. But to keep dragging and add spice, Nish will fall in love, then maybe turn negative or sacrifice bla bla.
I will be very happy to see Vatsal's character remain a positive cheerful guy who later becomes great friends with Abeer as I really love both these actors. But alas, hindi tele... we had started dreaming Nannu having a boyfriend, big secret. I won't be surprised if the writers suddenly forget all about the 'secret'