Situational Irony

     Jane Austen uses situational irony at this point.  You would expect that Mr. Darcy would be cold and aloof and surprises us all when he visits Elizabeth while she is alone in the house and suddenly asks her, "You cannot have a right to such very strong local attachment. You cannot have been always at Longbourn." And all the more surprisingly is that after that he withdrew a little and was back to his usual silence.
     Shortly afterwords, Elizabeth met Colonel Fitzwilliam while walking and learns that Mr. Darcy "...congratulated himself on having lately saved a friend   from the inconveniences of a most imprudent marriage...". She becomes angry and immediately goes to her room and thinks of what she knows. She begins too search her sisters' letters and finds a want of happiness in them. As she was doing so, Mr.  Darcy walks in. He begins to sit and then starts pacing the room. Elizabeth is surprised, but remains silent. Below is the movie clip of what happened next:

      This is an example of situational irony because you never would have suspected that he would feel love for her. Still, you can see that he has a lot of pride, which just lost him a bride.