In a way, it was like sixth year all over again. Remus knew he should still be furious. But, then Sirius actually let him see some emotion other than the cocky act he put on for the world, let him see the bit of sincerity Remus always knew was in there under the rebellious posh shell, and he couldn't hold on to that anger, no matter how justified. Sliding down the boulder until he was squatting in front of the man who had been like a brother to Remus at one time, he reached out to gently pull Sirius' fingers from his hair. "Stop that, you'll go prematurely bald," he chided softly.
"I don't know, either. It was all rather fucked up," he admitted, allowing himself the rare swear. "I had a mission I wasn't allowed to tell any of you about that kept me away more and more. You and James were still thick as thieves, but keeping more and more to yourselves. Peter was left on his own more and more. The four of us just...I don't know, maybe the war got to all of us. We stopped trusting each other."
Offering Sirius a sad smile, he pushed his own long bangs out of his face where they had fallen across his eyes. "I didn't want to believe you would do it. I still don't. Whatever happened...we were friends once. And, there may be something I don't know. Something that would make the pieces fit together. But, we're not going to find those pieces here. And..." He sighed softly. "And, I don't believe the you as you are now is the person who betrayed us, no matter what happened in your future."