[He definitely looks alarmed as she says that.]

Y-you know about that? [He quickly shakes his head.] Nevermind, that's not the important part.

Iris, I... [He falters for a moment, afraid of letting his foot into his mouth, but then he presses onwards.] I'm sorry! I didn't mean for it to be like that. I just... I wanted to make sure you weren't interested in someone else, and... I guess I picked the stupidest way to go about it. I'm so sorry.