Devin wouldn't claim his distrust of X was entirely rational. The reader would understand it, would know why the vampire reacted as he had, but that knowledge did not help. He had nowhere and nothing left only to him now.

He raised his eyes, again silent while he considered her question. The answer was at hand immediately, but saying it aloud was not so easy. Trust gets you killed. If she wanted, she could destroy him - although that would be true regardless of whether he trusted her from a physical standpoint. It was the rest of it, his wounds and his feelings and his past, that had always been more precarious to show others.

"Yes," he finally replied, and took a large swallow of liquor. "Are you suggesting I trust you, if I can't trust him?"

She did have a better insight into people's true nature than he did.