Jassi is not in love with purab. May be she agreed to marry Purab to make her family happy after all. If you are in love with some one you will try to adjust to his world. In the earlier episode of JJKN Jassi did dress up to go to a party with Arman and Raj. If she can do that for Arman than why not for Purab?Her not wearing the necklace was also an insult to Purab. May be Purab deserves better than Jassi.