Negan knew Judith and Erik's relationship was more complicated than her attaching himself to her best defense in the hotel. He wasn't stupid. He'd never seen her with someone in a romantic way before, but he knew how to read her like a book. The significance of the fact that she let Erik put a ring on her finger, even if it was just an act, wasn't lost on him.
Her question made him pause again, but that was one he knew the answer to right off the bat, too. He'd been living with the answers to her questions for years, he just hadn't been looking them in the face.
"Same shit that stopped me in our world," he admitted. "Nothing the hotel does fucking scares me. The dead pricks in our world never fucking scared me." The time and place didn't matter- the problem was him. It always had been. "If I didn't have so much fucking shit to kill after I lost Lucille, it would've fucking killed me."
He left the last part unspoken, because he didn't think Judith needed to hear him say it: he didn't know if he could do it again.