Disclaimer: Harry Potter isn't mine.
Remus' POV
When you learned Sirius was innocent, after so many years, you thought everything could the same as it was before Azkaban. Of course, you were wrong. In that one brief moment of ecstasy, you forgot Severus. Severus, who knew your secret. Severus, your lover, whom you betrayed. He let your secret slip, as you really ought to have expected. Of course, you couldn't stay at Hogwarts after that. How many times in the past two years have you cursed yourself for a fool? A thousand? A million? You've lost count. You left a wonderful man, not the most handsome, but in his own way he loved you. And what did you get in exchange? An escaped convict, slowly sliding into insanity and alcoholism. He stays in his room, drinking and sleeping, leaving you to sit in the library of this horrible place and think about what might have been. You could have been employed. You could have had a lasting relationship with Severus. You could have been something more than this. And to think you threw it all away for that clapped out wreck upstairs...