It is very clear how much Armaan loves Bharti, he cares about her so much but he can't do anything! He has a standard he needs to live up to as OK's brother, he cannot defend Bharti or say something for her sake everytime. Already by standing up for her the times he did, Bua, and and everyone else is talking about why he is defending her so much. Don't forget you guys, Armaan still believes that Bharti is actually OK's wife. When he believes that, how can he defend her so much, Armaan is Armaan. He would never have the family talk about his brother wife and him together.
And as for in MU, he can't defend her now because of the same problem he has at home. She is his brothers wife, or so he still believes. If he tries to defend her now, all the office people know his relationship with her, they will talk, and he won't want that for Bharti, it will be even more humilating.
As for ArBi, I still have faith that they will be together. I know they will. I still feel that this track was brought in for Bharti to realize she really actually loves Armaan. I just want Bharti to somehow prove to Armaan, only Armaan, I don't care about the others, that she is indeed Bharti Bhaskar, and not Bharti, OK's wife.. Then maybe they can go together to search for the real Bharti, OKs wife.
I, as you all know by now that I am the craziest ArBi fan so if I anyhow offended anyone, I'm truely sorry.