You and Simon were in a argument going back and forth about your relationship 'label'

The shouting grew into a full on yelling match Simon's fist started to clench so you decided to walk away

Before you could get far Simon grabs your wrist

"Let go of me!" You shout as you pull away with a scowl

"Bloody Fucking Useless!" Simon shouts back and before you knew it his fist snaps forward and he hits you