Hey Megha,
I get that there's a character journey for Ar but the way he keeps letting Ruhi walk over him is annoying when there's not even a base for their love story to actually feel sympathetic for him or Ruhi. These two people are delusional that their love is amar-prem but if they actually recall their journey, it's actually one of the silliest 'romances' to exist.
Ab has given him a chance to say why Ruhi is close to him. She shares her happiness and grief because she takes him as a friend - but this guy has not extended such a courtesy. Doesn't matter if they do not take each other husband and wife, they are friends now aren't they? Ar has absolutely no excuses.
And regarding him and going into the room, I highly doubt that's it's because he caught her in her crying phase. He is not blind to Ruhi's intentions - she effing HUGGED him and he knew it was not because she took him as her husband's brother. Before that hug, Ar maintained physical distance. Now he is going to her, touching her kaliyaan. Nahh to me his lusty urges have been woken up 
I personally say accha aadmi for Ab as a joke but at this point, yeah Ab deserves someone much better than Ar who don't know how to draw boundaries. Besharam #2 because Ruhi gets Besharam #1
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