On the regiments last day in Meryton what do Elizabeth and Wickham discuss?

On the last day before the regiment goes to Brighton, Elizabeth and Wickham talk about her trip to Kent. She had met Col. Fitzwilliam there and had spent more time with Darcy. The discussion, which makes it clear that she likes Darcy better than she had, makes Wickham nervous. He tries to bring up Darcy's alleged mistreatment of him, but Elizabeth is not interested in hearing about this, so the separate with civility only.