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"Indeed, Jane, you ought to believe me. No one who has ever seen you together can doubt his affection. Miss Bingley, I am sure, cannot. She is not such a simpleton. Could she have seen half as much love in Mr. Darcy for herself, she would have ordered her wedding clothes. But the case is this: We are not rich enough or grand enough for them" (21.18)
Lizzy is trying to convince Jane that Bingley really does love her, but Miss Bingley is trying to keep them apart. (Duh.) Notice Austen uses "affection" almost as a synonym for "love." We usually think of "affection" as a pretty mild emotion, but does it mean something stronger for Austen?