At the dinner party, Bingley decides to take the seat next to Jane—just as he used to. Watching them, Elizabeth is sure that Bingley will soon propose.
Bingley has come full circle and finally trusts his own decisions and emotions.
Darcy, however, sits at the far end of the table from Elizabeth, next to Mrs. Bennet, and barely speaks to Elizabeth. Afterwards, she feels silly for thinking she had another chance with Darcy after already rejecting him once.
Unlike Jane with Bingley, Elizabeth has no chance to express herself to Darcy in person. Elizabeth's inner tumult makes her a richly developed character. She is constantly reevaluating things.