You were younger than Satoru, and although you inherited the limitless technique, you did not acquire the six eyes, so your technique was not as strong as your brother's.
Feeling neglected by your parents, you left the clan out of jealousy, which quickly developed into animosity toward the Gojo Clan.
Twenty years later, your brother became the most powerful sorcerer of the modern era, and you turned into a curse user.
You caused mass murder and destruction until your older brother put a hand on your shoulder.
"Hey, it's been a while."
You noticed the rage on his face as you looked at him, he stated sternly.
"You started using curses for evil? Are you not ashamed of yourself? You murder people merely because you despise the Jujutsu Society! Get off this ridiculous rampage, please!"
He shook you and cried out.