He looked up at his mom - who was selfish and afraid to take the blame. To protect his mom he took the blame on himself. Wow in reality parents claim they protect kids but here it is reverse. Son protecting mom.
He mentioned all that happened when Yash was unconscious. So now Yash knows the truth.
Third telling that his parents only load them with rules to follow and no one can speak their heart or mind is what Arti tried to tell in the beginning.
Paridhi said the fact they have big house which is like jail no love affection etc.