I understand what you are asking about. I guess Karan fell in love with Tanya at one point after he got married to her. I mean, they were pretty happy for the 3 years Nandini was in coma. However, he loved Nandini more than he loved Tanya and so when Nandini left, he couldn't forget her and move on and so came to believe that he did not love Tanya.
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