Yuji Itadori, a boy who was originally born as a non-sorcerer but became a sorcerer overnight during a random day in High School --- all because he ate the finger of Ryomen Sukuna. Yuji has been Sukuna's vessel for months; he's been good friends with Megumi and Nobara for months; and he's been in a good relationship with his teacher for months. Life has been okay for Yuji, difficult but he overcomes his obstacles. A few months ago, after Sukuna's newfound vessel joined Jujutsu High, Yuji had a reunion with a tall, soft-styled, short brown hair girl named Yuko Ozawa. Nobara and Megumi helped Yuko ask out Yuji, and they've helped Yuji get a girlfriend. The only problem with this relationship is that Yuji had to hide his Jujutsu Sorcery life from Yuko because it's forbidden for a non-sorcerer to know about it. Gojo should've told Yuji not to date a non-sorcerer but he didn't. He didn't for Yuji's happiness. He wanted Yuji to just be happy and he trusted Yuji knew what he was doing.
Their relationship went on for a year. Yuji is now 16, Megumi and Nobara are also 16. Yuko is 16 too. The relationship may seem healthy like a field of flowers but last month, a blazing spark sparked into the field and burned down all the beautiful flowers Yuko and Yuji have planted together. That blazing spark was the spark of betrayal. It grew in the field when Yuko decided to cheat on Yuji last month. Yuko's actions only lasted for a month because Junpei (yes, he's alive in here) had caught her red-handed in the act, and he has photo proof of it. That photo spread to Yuji's loved ones quickly. Gojo knew, Megumi knew, Nobara knew, and Yuji found out. Gojo, Megumi, and Nobara are standing right next to Yuko right now. Their eyes are like a pool, a pool of shame and disappointment. Yuko's heart was overflowing with guilt, she felt she had accidentally hit a squirrel while driving.
Gojo: "Well... I figured your relationship with my student wasn't gonna work."
Nobara: "How could you do this?! After a year with him?!"
Megumi and Junpei didn't say a word. His expression is cold, colder than Gojo's, not mad like Nobara's. Megumi just stared at Yuko with a narrowed gaze. Junpei was avoiding any contact with Yuko, he couldn't even look at her. Yuko winced a bit at the criticism, she didn't know how to justify her actions.
Yuko: "I---..."
She was cut off at the sound of Yuji's footsteps approaching. Yuji has been looking for her. Her heart dropped the moment he was in her eyesight.