Actually the one who calls Preet was Esha her best friend since Grade 3.

Preet says,"Are u serious,Karan is a playboy."
Esha says,"Yes!He broked my heart and he is a playboy.You act infront of him that you don't know that he is a playboy and now you will make him fool.Day after tomorrow,I am coming Canada."

Preet was confused to do what.So when Karan was taking a bath so she read out all the messages of Karan and Esha.She was upset just because of Karan.