We have several points of view.
The funniest being when Elizabeth tells Jane that, had Darcy shown Caroline half what Bingley had shown her, she would have ordered her wedding clothes...
And there are facts : it were the men who asked ladies for dance, and he did so at the point of becoming uncivil, while he was generally extremely civil. Idem for keeping speaking with her.
It was impossible not to see Bingley was in love with Jane.
While Jane, obeying the codes of her time, kept collected and shew nothing but mere pleasure. She was not allowed to show more, and she managed very well. We don't have only Darcy's opinion, we have also Charlotte's, and do you really believe Charlotte to be prejudiced against Jane and wanting her not to marry Bingley? Even Elizabeth aknowledged Jane looked indifferent. And Charlotte knew Jane very well!