I wasn't sure if I should consider Darcy's letter to Lizzie a solilquy or not-he does write it when he's alone but it is meant to be read by another..anyway,let's just call it Darcy Unplugged!

It is the first time in the story that we get Darcy's thoughts uninterrupted(or slipped into certain sections of a chapter). I won't go thru the whole letter but will quote from some key dramatic sections:

"I write without any intention of paining you,or humbling myself,by dwelling on wishes,which,for the happiness of both cannot be soon forgotten....You must therefore,pardon the freedom with which I demand your attention;your feelings,I know,will bestow it unwillingly,but I demand it of your justice."

He's declaring himself to be merely heard,for deceny's sake,not backing down on his original positions and yet,does acknowledge Lizzie's feelings and asks her to be fair,which is somewhat considerate and a little less arrogant.

"There is but one part of my conduct in the whole affair,on which I do not reflect with satisfaction;it is that I condescended to adopt the measures of art so far as to conceal from him your sister's being in town...If I had wounded your sister's feelings,it was unknowingly done.."

After he explains why he felt it was necessary to dissuade Bingley from Jane(some of which gives a hint of Darcy's full proposal to Lizzie about her family's"situation"),he shows some regret in keeping Bingley away from Jane openly. I do believe Darcy is sincere in not intentioning to hurt Jane(can't say the same for Miss Bingley!)but his regret is mainly due to being sneaky about Jane's stay in London. I think he has sort of a big brother feeling about Bingley,which motivated him into taking action here.

"I must now mention a circumstance which I would wish to forget myself and which no obligation less than the present should induce me to unfold to any human being. Having said thus much,I feel no doubt of your secrecy."

Now,is that a dramatic statement or what?! It also shows how Darcy really respects Lizzie in having no doubts about her spreading the story of his sister's near elopement with Wickam. It is a vivid contrast to how Wickam"reluctantly" revealed to Lizzie his story about being cheated by Darcy. Darcy has a modicum of privacy in telling his story in a letter while Wickam told his story in an open room where anyone could have overheard the conversation(no matter how low their voices were!).