Feels good to be on right side
"What do you think?" Harry raised his brows and said more. "I already knew that you were hiding something. I was just surprised that day to see that my friend, Soham, is being so kind to my sister that he hid things for her too. Moreover he let you stay at his place so easily."
That time Harry didn't notice that much strangeness in Serene but found a lot in Soham's nature. But when he noticed how for the whole week Serene avoided his closeness, Harry knew that she was hiding something from him.
But thinking that it was something between Soham and his sister Ishaan didn't try to intervene. But he knows she must be hiding her injury from him. This feels more frustrating.
She was in front of him but he still couldn't detect the main problem of her's. He was frustrated because he felt as a failure to be her elder brother to not even see through her after all this year.