For someone who loves his wife more than anything else in the world. For whom he can fight the whole world. For that person to act as if he does not know her. To see her in pain yet not comfort her. To be by her side in her time of need but not able to is something very difficult. I am sure that he will totally breakdown at one point. Now he is keeping himself together, but there is a limit to a person's patience and emotions. I think his breakdown might happen when he lands foot into the Patel household. When he enters all his memories will come back. He will be sad to know that he has to not remember any of it. He might go into their room, and see his life. So much possibilities when he enters the house. But one thing that I feel is keeping him strong is that he knows his target, that is Shabnam. He knows he has to pretend to be Raghu so he can destroy her for everything she has done to his family...
I am waiting for the moment that all find out the truth. I think Nani might be the one to know that it is in fact Sid. She might be the one to break him, but he will as usual make his pushpa promise him to not say anything as then his plan will fail.
I am wondering though, if he is faking then would the lady and Pinto be aware. I mean Pinto knows something, but it seemed as if he also felt bad for Roshni, seeing her in pain. I think he knows what Sid is planning and that he is pretending to be Raghu, which is why he knew that Raghu was Sid and that name was a rich person type name...