Because.....
1. There is really no one to fight for Nupur here anyway because she won't let them..
2. Dhruv atleast had faith in his love for Nupur to look for her for three years
3. Rati the actress can do soooo much better than this idiotic crap role
4. If Nupur sticks around the show will go back to random lame trip-catch-eyelock-hug sequences which would have more possibility for causing eyesore
5. If Nupur leaves maybe Mayank can jump off somewhere and the show can end faster.. And SaJan fans will finally be happy with constipated baba and moaning myrtle union..
Please feel free to post your own wonderful reasons for why she should leave the city with Dhruv.
because->
Dhruv will loweee her more than random eyelocks,pheeling up in corridors,catching her all over when she trips...in short,a psycho guy is better anyday than a bumbling goofball
if she leaves again,Ganji's leaking tap will work overtime and she will die of dehydration.
Mappu will get his share of costumes.seriously ,the designers have a fixed budget and the more the number of characters the lesser the quality of outfits they give the characters.
B.E.W.B can go fry himself in that bike race and the show can finally end
both Dhruv and Nupur can book adjacent rooms in the trauma unit and psychiatry inpatient and live happily ever after