Elizabeth's feelings during their argument were clearly outlined in Chapter 11, but how do you suppose Darcy was feeling inside?

In Chapter Eleven, Darcy and Elizabeth engage in a bit of sparring, neither one wanting to allow the other the upper hand. Elizabeth is antagonistic, but if you look at it closesly, she also seems to be flirtacious. Darcy, however, doesn't give in inch. He is hard and factual..... responding without the emotion that Elizabeth finds difficult to hide.

“I am perfectly convinced by it that Mr. Darcy has no defect. He owns it himself without disguise.”
“No,” said Darcy, “I have made no such pretension. I have faults enough, but they are not, I hope, of understanding. My temper I dare not vouch for. It is, I believe, too little yielding—certainly too little for the convenience of the world. I cannot forget the follies and vices of others so soon as I ought, nor their offenses against myself. My feelings are not puffed about with every attempt to move them. My temper would perhaps be called resentful. My good opinion once lost, is lost forever.”
“That is a failing indeed!” cried Elizabeth. “Implacable resentment is a shade in a character. But you have chosen your fault well. I really cannot laugh at it. You are safe from me.”
“There is, I believe, in every disposition a tendency to some particular evil—a natural defect, which not even the best education can overcome.”
“And your defect is to hate everybody.”
“And yours,” he replied with a smile, “is willfully to misunderstand them.”