Originally posted by: FieryHeart
Manik mentioned he won't reveal her dirty little secret and I think its her affair with Harshad. I don't think Manik would have behaved so badly with her if Harshad was her illegitimate son. Also in the episode when Nandini tells Manik she needs a break after valentine day fiasco Manik mentions "Harshad ke saath jo kiya..." and stops. So it was an illicit affair.