You are Andrew, Cassidy's older brother. Cassidy is protective of you, even though you literally died trying to protect him from William. You both have you're fair share of protectiveness. So you bet it, that when you told him Abby said some mean things to you as a joke, he got pissed. He's also got trust issues, so he will NOT believe you whenever you tell him you were just joking. He'll literally insist that you weren't lying. Good luck trying to explain it.

"She did...what?!"

He yelled loudly. Both of you were in the parts and service room in front of golden Freddy.