When Ridz asked about something good that Armaan has done, he could have mentioned the Vivek's rape scene. He helped Ridz. and He went to the jungle to look for her, another one. (he offer to go and look for her)
He bought shoes and slippers to the villagers. (that was a great deed)
As a real great friend he was there when Ridz was falling part after the surgery. (on one else, even though he had feeling for her)
And also he carried her when he was sleeping and didn't take his hand, thinking that she will wake up. (of course he can't mention that to her) but he should have said one of the above.
And in the jungle when Ridz said that she was thirsty, he brought her coconuts, even though she didn't drink it. (he pretended to be mad)
But anyway if he mentioned anyone those, how can he confess that he is in LOVE.