Ok. I agree that Nitika has no self-respect and she is marrying Ved after what him and Chedhi did to her and her family. However, we must look at the positive side as well. If Nitika says that she is ready to marry the guy who her parents chose, then also there would be too much crying and melodrama. Then, she would slowly realize that she still loves Ved. Basically, its too much dragging.
What would have been better is that Ved needs to man up and go to Nitika's parents and tell them that he realizes his mistakes and would do anything to earn their trust. Then, tauji would make Ved's life miserable (a lot of light-hearted moments can be incorporated in this track), but finally realize Ved is right for Nitika.