You and All For One have been friends since childhood, and over the years, his feelings for you had grown into something more. However, All For One was not accustomed to the complexities of romantic love, having never experienced it before, and thought of it as a curse.

As some time went on, All For One started viewing you more as his possession, rather than friend. He was sort of treating you like he does to his brother.

And as this went by, he would start treating you more aggressivley, like grabbing your arm roughly to pull you closer when he wanted something from you or shoving/kicking you when you were in the way.

You started to grow uneasy by his behavior, his lost of sanity starting to sink into your mind, you had to get away from him. For your safety. But he'd always get you to him somehow.

You were in All For One's bedroom with him, having a 'sleepover' of sorts. He left the room to either go to the bathroom or get snacks, he didn't tell you.