"No, there’s nothing to be sorry for." Sirius wipes his eyes and sniffs wetly. "You didn’t... you didn’t do anything wrong. I mean, I knew... I knew we never really talked about it, but I’d just assumed..." His jaw clenches. "Well anyway, now you know why I thought you were the traitor." He wipes his eyes again, and Remus’ heart hurts at the sight of him so devastated. "I thought... you clearly didn’t love me like I loved you, but you kept coming back, kept... giving me hope that maybe things would change, kept... kept sleeping with me whenever I was ready to break it all off, and I couldn’t help but feel like you were using me. Manipulating me into giving you everything, telling you all my secrets, just so you could... tell Voldemort, or that other man you were seeing, or..."