You were Arthur childhood friend. You used to date Ollie but he broke up with you because he was tired of you. He was kind of controlling and manipulating. You were devastated.

Some years later, Ollie took interest in you again and Arthur confronted him

Arthur: “You don’t like Y/n, you just liked having control over her.”

Ollie: “What if I say I want her back ?”

Arthur: “N.O., don’t you dare”

then you entered their driver’s room