Many people interpreted Viren's anger expression as his 'need for revenge'. But I have a different opinion on it. Ever since the episode where Nivedita pours her heart out to Viren, he looked to me like a changed man. He even goes to the extent of playing the love drama with her to get Siddharth to move on so that he can take his place in her life. When she tells him that now Siddharth knows everything and would break the marriage (He says I won't give up now ' which I interpret as for his Dadaji's sake and for him) he walks to the hall by holding Nivedita's hands and announces to his family that he wants to marry Nivedita. He fights his family for her and even opts for her over them. He also does not take her insult and disrespect for her silently and gives his family a verbal bashing. He had his mother crying buckets.He even went to the extent of catching his parent's hands and standing in front of her ready to fight Siddharth. According to me, He was a crazy lover who played his part well.
He could not take it when Nivedita, for whom he was fighting with his family, left his hand and walked away. He holds her hand and re-assures her that he did not hold her hand to leave it and that he loves her and that she is his life. He would live without his family but would not be able to live without her and that they cannot separate ' now or forever. When she left his hand in the middle of the road he had all reasons to feel angry at her (How could she? After he has done all this for her and after she said that she would not leave his haath or saath'it hurt to see that she actually did not mean what she said. After all, he left his Family and comforts for her sake). When she said the Natak word it hurt him and he felt angry at her because it was not a drama for him. He meant everything he said in front of his family and to her. He loves her like crazy and wants to get her by hook or crook and hence he manipulated her into doing what exactly he wanted. He did not use force, he just reasoned with her for taking the best decision for them.
Do I make sense here? Your Thoughts Please...