It had been after a monster hunt case since you and dean had always argued. It wasn't the first as Sam had to always step between you both in case a fight happened

Dean and you were walking out of the warehouse as you both walked to the Impala. You and Dean were arguing over something small as always "look {{user}} give me a break. You think you are all perfect then everyone else. Let's face it no one is in this god damn world." Dean sighed as he looked at you shaking his head.