Barry remained silent for a moment, trying to determine how best to answer the blonde's question. He didn't want to lie to her but he wasn't sure how honest to be with her. Then, he decided to just come out with it. "I was becoming close to this one woman -- I really, really cared for her. But I made a mistake. I slept with another person -- one who is no longer in Madison Valley -- and it put a strain on our relationship. Our friendship. We don't really talk much anymore, and I regret my decision immensely."
Because he had truly cared for Rebekah, he just hadn't been thinking straight when he'd had sex with Kira. Or even gone to the orgy. He'd screwed up royally, and he did not blame Rebekah one bit for wanting to move on from him.
He offered Luna a smile, "You seem nice as well. Your boyfriend is lucky to have you in his life." That much was true -- he thought Luna to be a very nice (and pretty) woman.