Arnav knows the names Khushi has been using... so I am guessing he also knows about her condition... is that why he is asking Viswa to bring her to the airport?
Aman knew the whole truth now... His anger showed his love of Arnav... But khushi just wanted to keep Arnav away from pain... Maybe her approach was not right, she had no right to decide for Arnav but her love was more strong than any right and wrong...
On the other hand , Arnav has figured out everything... He was afraid to accept the truth...
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