Very nice post.. I agree to most of it. But not the last bit. For sameer even in Naina's case he thought that he will say sorry and after some bashing Naina would forgive him. But when they first came face to face in school post bet revelation, it was Naina's reaction which left him confused and more guilt struck. Where as Sunaina's reaction made him free of guilt.
Naina's reaction was like she forgot something happened between them and tried to behave normally avoiding any discussion on the topic. However su reaction was its OK, you can do whatever with my emotions. I don't mind.
if su's reaction was different, sam's reaction would also be different. However i dont think he would have gone to an extend of spending whole night outside her house.