The demon could've known his name because he'd been in Hell, sure. But the other things he knew?
"Because he knew what Phaedra knew. And I didn't even tell you. He said I was afraid," Dean said, watching her wrap her arm. "And then terrified? And I was."
He sincerely hoped that wherever Phaedra was, she was enjoying this.
"That I was gonna lose you again. Before I said anything."