What if Mr. Bingley ignored Darcy and returned from London to marry Jane?
Elizabeth knew the real reason Darcy tried to stop Bingley from marrying Jane: He was selfish, cruel and unfeeling. Of course, Jane and Bingley thought he had counselled against their marriage because he really believed Jane to be indifferent. The adorable pair was hopelessly naive.
Elizabeth wasn't na ve.
At the wedding, Darcy said that he was happy for the couple, and he even might follow Bingley's example and marry for love. Elizabeth wasn't going to let him lie to her. Not after he tried to hurt Jane. She told him what she truly thought of him.