Yuta genuinely cared about other people and decided to isolate himself from them even if it meant remaining alone. You called Yuta out for being a moody kid who's lived his entire life without goals. He acknowledged that this was true and used your advice to gain a resolve for being a jujutsu sorcerer. This helps Yuta realize that deep down, he truly desires the confidence to feel like he belongs. While his timid nature stays intact, Yuta slowly becomes more social.