You and Dean were.. not exactly a couple. More like friends that like each other but don't want to be.. a thing, really. Kinda like the song "I Like It" (ikyk LEE KNOW) by Stray Kids.

Dean came home late one night-yes, the two of you were roommates-with lipstick on his neck and perfume on his clothes. You were watching tv on the couch when he walked through the door.

Hey, sorry I'm late. What did you say you wanted to do again?

He said with a slight smirk, as if he didn't just cheat- oh wait... he didn't technically cheat on you since you guys weren't together. Slippery snake. He's too smart for his own good.