As far as I understand the characters.
1. Virat knows Pakhi's feelings. He is not dumb because she tells him directly. So he knows the extent of her feelings too.
2. Sai knows there is a past but not to which extent. So she thinks Virat is emotionally attached to Pakhi.
Now the contention comes when Virat wants Pakhi to be his brother's wife to preserve the family izzat, or for his brothers sake. His brother is married to this woman. No body wants the marriage to break without giving it a chance. Also, divorce is still not a small thing in Indian families. Added to this he knows his brother is a gem of a person so hopes that Pakhi would eventually find happinees. Virat might be thinking about all these things when it comes to Pakhi. Why does he have to? Because he is a family man at heart, he was responsible to get her married to Samrat, and because they did not have chance to explore the marriage. If anyone of this has not played the part, he would have cared less.
Coming to Sai, why he is not clear? He told sai, now not before, there is nothing between them. He meant emotionally and physically too. But is he really comfortable with Sai as a wife to discuss his secrets, like how he fell in love with pakhi and all the Nasik incident. Sai has to make a connection with him as a friend. they are in love and lovers hide their previous crushes for several reasons: could be rejection, to avoid insecurities etc. Virat on the other hand, is trying hard to make their relationship foolproof to all this turbulences. But what the guy is not understanding is Sai's mindset. He does not understand the damage that 'comittment' word caused to Sai's mind. May be Sai is waiting him to be more physical with her as in normal marriage so she can get past the commitment or she wants full confession of love to her. He doesnt think from her perspective.
For him, Sai came into this marriage as deal and because she keeps repeating their deal, he tries to make her fall in love with him and it is taking time. That too given that the ex living in the same space, it is getting even more difficult.
Solution is to sit and talk. But that would end the story. The better way I guess is to show their progression as friends, companions and then lovers. Pakhi can keep adding blockers but the end of it there should be some progression. I just want Virat to stop Pakhi from barging into their room and giving her any importance. He can be courteous to her but ignore her royally. Otherwise, there is no true progression.
Tagging a few to give some perspective
@bold I agree but I think they are way psst that. Both want each other as husband and wife. Virat offered friendship on the MS day since Sai gets a little detached with him sometimes and he wanted to build something between them, give some confidence to her that he will always be there for her.
In the present I doubt if he would want only friendship, he might try to offer it only to remove some roadblocks, so that he can start entering her heart slowly but Sai might not like the idea of friendship because she wants to be his wife and him offering frienship can even offend her. That would make it look that he wants nothing more than that and also for it is not even necessary for them to become friends. Have to wait to see her perspective.
The original question fron Kavitha
"It seems that Virat does not understand Pakhi's intentions while Sai can see it. Or even if Virat knows Pakhi's feelings for him, he denies it before Sai & says it is nothing like that.
He would shout at Sai when she tries to tell him about Pakhi's motives."
Virat now knows Pakhi's feelings and also what she wants. But Virat is still not able to see to what extent Pakhi can go to get what she wants. He has been noticing her activities, her talks and what she is doing to Sai, how much she hates Sai too, what she was trying to do after Sai left to college too but at the same time he feela that is it a temporary one and she will be able to come out of these. He is waiting for her to change her ways and thinks that his warnings will be enough to make her understand. Also, at the moment is more concerned about his and Sai's life than her. He would care for her as a person but would keep trying to tell her that she is just his brother's wife.
Sai, on the other hand has understood the gravity of the situation even more than him because she is facing the wrath of Pakhi's jealoust and hatred. Moreover Sai has always been noticing it and has understood what she wants whereas Virat has just come to know. Sai has spent more time wih Pakhi than Virat at home too. She has not just understood Pakhi's jealousy, understands Pakhi's feelings, hurt and pain as a girl, as a lover too sometimes. If Pakhi was not this vile with her, Sai would have empathised with her and wouldn't have been harsh many times. Sai is also in a turmoil, feels sorry for Pakhi and at the same time becomes a jealous or possessive wife. This avatar comes out when she and Virat would have had made some progress, when she starts to feel that Virat has something for her too, when she starts to live with him like how any husband and wife would do unknowingly, when she starts hoping or living in dreams without her own knowledge.
Now, when Sai can see where Pakhi is moving towards or develops suspicions about Pakhi's moves, there are possibilities that Virat might not agree with her because he wouldn't be able to look at Pakhi as that vile. His first impression about her, some faith that he has on her, his guilt added to to him wanting to give her a benefit of doubt will make him neglect her actions and give her a chance so that she can also have a good future and his brother's life also doesn't get ruined. This is until Virat doesn't witness or face something big. He will understand the severity of the issue only if he gets to face some consequences that are results of Pakhi's actions.