It was cute. Jassi's confession was a pleasant surprise to him and he would have given anything to reciprocate what she said. But he knew that it would not be a prudent thing to do and so kept quite. I strongly believe that if you truly love someone then you would want that person to be happy, even if it is at your own cost. And that is exactly what Armaan is doing now. It is not an easy task for him considering that he himself was a spoilt brat. But he is trying his level best. I hope Jassi understands him.
true! maybe he is trying not to put her in a sticky situation. another possibility is he prolly waiting for jassi to realize that she wont be happy w/ P anyways. third possibility is he is following jassi's theory of if u love someone set her free...