I think jealous is the wrong word ... I see the topic title also just changed!!! 😃
I feel Nupur is more hurt than anything - hurt and upset, that her little sister who always idolises her and follows her in everything, can ever go against her ... and she hadn't heard gunjan's full conversation with Samrat, just the bit about bauji ki majboori, but not the part about 'di is also right in her place'. And the Sajan parts today - any older sister would not be happy to see her younger sister romancing in public, not with their upbringing, and Nupur has always beena very protective older sister. Also - to be fair to Gunjan, she was not comfortable with it either, and I think she will let Samrat know that pretty soon (that is of course if she stays in character - always a dicey one!).
What made me wonder was Nupur's last dialogue about gunjan being bauji's good girl and her expression then - but again, I don't think it was jealousy of Gunjan, it was more hurt that she (Nupur) did try to follow what her Bauji wanted, gave up Mayank ... but due to circumstances he misunderstood and she has become bad in his eyes - so it's more about upset with the distance from her bauji than about Gunjan per se. The hurt is being expressed as bitterness that she (Nupur) was so misunderstood - but I don't think Nupur in her wildest dreams would want Gunjan to suffer the same fate as her - that's not Nupur.
As for Gunjan supporting bauji - well, I've seen a real life example very close to me so I understand Gunjan's pov and her support - Nupur is not alone - she has Mayank, his mother's support and the support of all their friends, while their bauji is painted the villain of the piece and if gunjan also goes against him, he is completely alone. Even if Gunjan sympathises completely with Nupur, you CANNOT ignore 20 years of love from a parent and stomach the fact that he got insulted by strangers due to a fault of your sister or brother's REGARDLESS of how unintentional that fault was. I think no one on this forum, if you think of your own dad, would like to see him getting insulted. Regardless of whether your dad was right or wrong - at least, I couldn't. Even Nupur tries to defend her dad's actions to Mayank, but for her the hurt from bauji is more, Gunjan is able to look at both sides and see her dad's pov as well. Especially as all the circumstances were such that they painted Mayank blacker than pitch in bauji's eyes.
the last point that someone brought up - Mayank and Nupur being indebted to Samrat and that creating misunderstandings ... ... could happen and that might worsen relations between the sisters ... let's see where the cv's take this. Nupur is the one who had the dreams of 40 inch tv and servants and a beautiful house, and with Samrat getting public about his love and showering Gunjan with gifts while MN struggle - that definitely has potential for some conflict ... and again, very true to life - I've seen this happen too.