I thought so too Chandrima,
In one of the episodes Nisha asked Arjun, will he be able to protect Poorvi and his reply was "I have grown up in this family and I know to what extend they can go".
Nisha also warned Arjun, that Poorvi is a simple girl with simple wishs and simple hopes and dreams. He kept saying yes.
Whenever there was a need for him to stand up to Poorvi in front of the whole world, he backed down and hid behind his family for their so called "izzat" - respect. And than in the middle of the night he goes n forces Poorvi to confess her love (nite when he kidnaps Poorvi after his engagement).
As always nothing personal to the actors Navi and Aparna, they are fatastic, it is just that EK and production house don't know how to utilise their talents