If this whole concept, leads to Kumkum, being mentally imbalanced and that she imagined that Salil was the murderer, then this would not only be stupid, but also the worst storyline.
You have to look at two facts-:
When Salil talks to Nali, by looking at the stars and admits that he killed her, but he wanted to kill Kumkum.
When Salil killed the guy who he sent to stalk Kumkum and kill Nali, because she heard everything.
In both of these Kumkum couldn't have dreamt them up, because she was still acting normal during and after the scenes. She didn't have any idea that Salil was the murderer.
So come on yaar think straight.....!