This naturally introduced a panegyric from Jane on his diffidence, and the little value he put on his own good qualities. Elizabeth was pleased to find that he had not betrayed the interference of his friend; for, though Jane had the most generous and forgiving heart in the world, she knew it was a circumstance which must prejudice her against him.
– Jane Austen
Pride and Prejudice, Chapter 55. Jane is understanding of Mr. Bingley for initially abandoning her and taking off to London, and she praises his shyness and modesty. Elizabeth is relieved that her sister doesn’t know the role Darcy had in Bingley’s departure, otherwise the usually forgiving Jane would be prejudiced against him.