After returning from the past, he was left without understanding why he was not selected for the Slytherin but for the Gryffindor.
Explanation:
This question is about "Harry Potter and the cursed child", when he uses the necklace that allows time travel, to go to the past. On this trip he is faced with innumerable information that leaves him confused, mainly in relation to him and his father. When he finishes watching and returns from the past he is very thoughtful and does not understand why he was selected for the Gryffindor, since the past shows that he must have been in the Slytherin.
