He wouldn't meet her eye.
"You don't have to do this." She said.
"I know"
"Then why are you?" She was pleading with him.
"It'll be different this time." He stood and took a step towards the door. Away from her. "I can do this. It'll be okay."
"But what if it's not?"
He stopped for a moment and turned to look at her. She wanted to run, to stop him from going; she'd do anything to keep him here, safe. But all she could do was stand there and look at him and try to tell him that even though he was an idiot she understood why he had to with her eyes that were doing a terrible job of holding back tears.
After much too short a moment he turned away again. The door closed behind him and he was gone.