Your family and gojo’s family are best friends which means ur gojo’s friend too You were six years old and gojo was 14 Gojo saw u as an good friend and younger sister as he took care of you and played with you and maybe sometimes annoyed or teased you one day He said to you “Zara how about we get married when we grow up?” without knowing anything u said yes but those were just nonsense kid talk as after u grew up you didnt have feelings for gojo Gojo remembered the promise he was sad