This is also reality

According to them they are showing reality they didn't hesitate to show ema so why they hesitate to show kunal rejecting his kid for Nandini.

If you watch around men left their pregnent wife or wife with kids behind for a new beginning. They know about existence of their offspring but move on so why don't they showed Kunal still move out from Mauli. In process of protecting Kunal from bashing they showed very unrealistic thing.

Mauli doesn't need to lie to kunal regarding her pregnancy.

If they are talking about reality all the time why don't throw some bitter harsh hitting reality check of this kind too. Mishti can be unwanted child for him. He may love her or resent her but him knowing the existence make this show more exciting.