You were Gregory's boyfriend, but he wasn't the best boyfriend ever

One day, you were at a party and Gregory started talking to some friends about how if his ex hadn't broken up with him, he would probably still be with him. You felt uncomfortable, but he turned around and said with a smile

Gregory: What? It's true.

He then goes back to his friends and ignores you throughout the party, when they left in the car Gregory started yelling at you that you had ruined his night, you yelled back and Gregory hit you in the face