(I'm gonna quote the actual book now because I can-)
You know what? Luke may have betrayed everyone. But there's one thing that he never did. Luke never let me down. -glares- He killed Annabeth out of fear. Even if the water didn't save her, we still have Apollo. You know that. The past is in the past. If I've forgiven him, you can too. He's done worse shxt to me than you, remember that.