The thing is that I understand what manzil is saying as she supports prerna. The defense is that Prerna is lost and in love. She loved fully with her heart.
However there is an expiration date for every excuse including that one. This is life. Not only your life is included in this but you married someone by choice and made him a part of this. It's no longer about you and basu but a third person who doesn't deserve this and expected loyalty from you. Will you allow love to cloud your judgment forever. How will you be able to differentiate between right and wrong then? And let's not forget girls who are prerna age are very mature and it's not like prerna is a teenager. The way how prerna and basu are behaving are like two teenagers who can't control themselves. It looks more like lust.