First, Anu is fool because, a genius girl like her reacts foolishly on someone's blame without trying to reach to the fact. She does not believe and even do not allow to speak Nikhil at all. Do you think that really happens. Then after, she forgets that Nikil was ready to sacrifice his child and love for his friend. If he was only after his child how could he do that. And remeber it is Anu who did not allow to happen it.
Then her Mother meera is another fool. because she knew the fact that Nikhil signed the apper in hospital to kill his child just to save Anu. Why the hell she did not tell that truth when Anu was in thinking worng and taking such fool decision.
Anu, Mera are are all charateras. They do what foolish writer or director want them to do. But these writers and directors do it because we are the fools who keep watching such bullshits.