"Bones?"
To his surprise the door flew open, she stormed out, pushed him and yelled:
"Stop calling me that !!!
Booth backed away. He hadn't expected her to be mad at him. After a few minutes he finally found his voice again.
"Why?"
His voice was a whisper.
I know she never really liked the nickname, but I thought that she was getting used to it, maybe even started to like it.
Her voice was cold, steady and hyperrational. She looked him into the eye and said:
"Because HE did."
He could feel her pain.
No wonder she's been acting so strange towards me.
Before he could stop her, Brennan grabbed the car keys and stormed out the room.
Leaving a crushed and horrified Booth behind.