Mauli made a mistake by overlooking all his negative qualities over his few positive qualities...it is not like he is completely negative..she must have starting loving him for his good qualities and loving nature but that doesn't mean he never had any flaws...
So that someone was also responsible for Kunal changing from a sincere husband to shamelessly committing ema ...abusing and doubting his wife...ditching his family right...all this was done to glorify that someone..
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What are his positive qualities that made Mauli overlook Kunal's negative qualities, according to you?
None ever said that kunal doesn't have flaws, humans are not perfect, even Mauli is flawed in some way because she is a human...
Also by your post, Kunal obviously has many good qualities which made Mauli fall in love with him, that's what Dida said that because of his one mistake, we overlook every good thing he has done...
I'd reiterate this Kunal is not the Kunal which was introduced to us, ab bhagwan ke liye insano ko thodi takleef to hoti hai