It wasn't difficult for Ruby to determine he was telling the truth about that, but as a personal master of hiding more specific truths within the ones her intended audience wanted to hear, well...
Takes one to know one.
She watched him studiously for a moment, then gave the facial equivalent to a shrug. "A little something about me?" she hinted, making sure she had his full attention front and center.
"I find half-truths really boring. Unless they lead to something more interesting." She ended her matter-of-fact sentence with a half-truth of her own; Ruby's eyes- whites, irises, and all- went black. She continued to smile at him, letting the point sink in for a full two seconds before returning them back to normal.