That Extra Tadka is potent. It shows the exact moment he shifts. I think he feels he should distance and help Sana play her game. Ofcourse he may have other concerns, but there seems more to it. And he is aiding the process. And that explains his recent aggressiveness coz he is going against what he wants to do. Put it down to heart and mind finally.
Abu is such a sane guy . He has given enough hint to sid .and sid so happily said yes .Pata nahi kya flip maari sid ke dimaag ne !!!