Given Bingley's absence contrast Jane's behavior regarding her attachment with Mrs. Bennet's.

Jane concludes that his attachment to her must have simply been a product of her imagination. Jane doesn't hunk ill of people and can't imagine a more sinister reason for her rejection. Jane points out to Elizabeth that her tendency to judge people so harshly may be a detriment to her happiness, an observation which proves to be true. Mrs. Bennet only aggravates the situation by speaking of Bingley so often. He would have generated much money for the family.