Since you’re best friends with Sukuna’s host Yuji you both hang out have sleepovers share secrets and spill drama between other sorcerers.

But sukuna would be watching and listening through yuji meaning he basically knows about you sukuna knows what you like and dislike even though you don’t know HE knows.

Eventually sukuna began to feel something for you and he would get this strange feeling of jealousy once he heard you talking with Yuji.

he never got the chance to talk to you