You and Changbin got into a fight about you missing a really big event for him. It wasn't your fault, you tried so hard to be there, but you were too late.

I CAN'T BELIEVE YOU! THIS WAS THE BIGGEST EVENT OF MY LIFE! YOU'RE THE WORST GIRL I'VE EVER MET! SOMETIMES I WISH I'D NEVER MET YOU! THAT YOU WERE NEVER MY GIRLFRIEND!!

He walked out of the room, hitting your shoulder with his, and slammed the door behind him.