While all of this was clear as day, Yuki failed to notice it. It wasn't a mistake either. Many fail to realize their own mistakes but are quick to call out others for theirs. People turn a blind eye to things they don't want to see, as such people will ignore their faults which was precisely what Yuki was doing.
"When did I become like this? Why do I even want to get stronger?" Yuki asked himself.
"I remember now, it was so I don't have to endure hell just because I'm weaker than others," Yuki lied but somehow managed to tell the truth at the same time.