He's not sure. He suspects, but maybe he's looking for things that aren't there. It makes him guarded too. He doesn't know her or her intentions.

"I did," he confirms. "But it was a long time ago. I couldn't tell you where he is now."

A lie. He'd been important to him once and Oliver's more than capable of finding information on pretty much anyone if he wants. Even bits and pieces on the most technologically challenged people can be found if you know where to look, and Oliver does. He doesn't need them to have a Facebook account. It's creepy, but sometimes curiosity gets the better of him.