You wanted a chance to repair your reputation and Rich, against his better judgement, gave you that chance. And you dropped the ball. When you get a second chance jump on it without delay.
All I can suggest is a sincere pm to Rich begging for one last, last, really last and only last chance. Promising to pay immediately for a similar value book to the one you failed to pay for.
Rich has made it clear he wants no more contact with this person.
I can't help trying to fix things.......how's your garburator?
Don't put your hand in first!!!