Prerna's feelings for anurag and bajaj are drastically different.
She has a protective instinct for anurag(which I have never seen a woman having for any man other than her son or father or brother). She is always there to protect him from all danger.
On the contrary, with Bajaj, she doesn't protect, she expects him to protect her. She knows that he is the man...the one who will protect her from all dangers.
I would say that her relationship with anurag is very rare and unique.These two can think alike, and they transcend the boundaries of gender. It's a relationship between 2 equals-not a traditional man-woman relationship. It is highest and purest friendship between two souls..gender doesn't matter.
Whereas, Prerna-Bajaj are the typical woman and man. Man is the bread-winner, and protector. Woman sits at home and nurtures the family. That's the way they have always lived.30 years of marriage, and a big family full of kids- they have lived the way all normal couples live. and they would never think alike , because he'll always think like a man, and she'll always think like a woman. This is a relationship between two unequals, as they say- opposites do attract.
As I said, anurag-prerna transcend the gender barrier and they also share a very platonic bond. On the contrary, rishabh-prerna relationship is based on the physical tension and attraction that is obvious between them from day one. It is the most primary, oldest, and most natural instinct between a man and a woman, so nothing wrong in it. But one must appreciate that rishabh-prerna have managed to take their relationship from the basic mutual physical attraction to a more mature and deeper relationship- a marriage.