Remus had often felt undeserving, and for so long had questioned why anyone, let alone people as amazing as -- well, at least as amazing as Sirius and James were -- would want to have to put up with all that came along with being best mates with a werewolf. But they'd never wavered. Sirius, especially, had always been by his side through everything.
They'd always been able to balance each other to the point that each side of their proverbial scale remained level. They countered where they needed to, and they were similar where they needed to be. They were able to bring out the best (and unfortunately the worst) in each other, balance what needed to be but without stifling the other to grow or be themselves. It was rather remarkable, and always had been.