I remember when Nandini told Mauli that she was preagnant
Mauli told her that how happy she is because a home,husband and kids were Nandini's dream.
Many people have a dream to marry and have a kids.But they are the part of their dream.For Nandini this was her only dream.
The problem is that the lady does not have any patience and was always desperate to get a man and marry.
Thats why when Mauli told Nandini about Rajdeep she just refused to believe it.When your best friend says that your partner tried to molest her then atleast try to investigate.But no For Nandini that man was her everything.Her dream.
When she married him she experienced hell.He was nothing like she imagined and her dream broke and then she remembered her friend.
When Mauli took Nandini to her house,Nandini in my opinion must have felt jealous of how good husband she has got.Yes she said that she is happy for her but if she would have been happy then She would have left Kunal for Mauli.
Slowly she starting adoring Kunal and found a potential partner in him.When Kunal claimed his love she again found her dream about to come true and again without a thought just grabbed this opportunity.
As a selfish person she must have thought"I have suffered so much.Itni mushkil se mera dream pura ho raha hai so How can I leave this opportunity."
Simply for Nnadini frienship actually Never mattered.She was just desperate to get married to man.
The sad part is that for Mauli, Nadini was a very important part
Part of her life.She must have never thought that Nandini will be so selfish to just use Mauli and then betray her.