Within the novel, Austen has used Jane and Mr. Bingley as the subplot to the book. Austen shows how Jane and Mr. Bingley need to get together before Elizabeth and Darcy could.
<Tab/>In chapter thirty three we see how Lizzy is speaking to Colonel Fitzwilliam. We see how he discusses with her how Mr. Darcy is in fact heroic because he saved a close friend from a bad marriage.
"...he congratulated himself on having lately saved a friend from
the inconveniences of a most imprudent marriage, but without mentioning
names or any other particulars, and I only suspected it to be Bingley from believing him the kind of young man to get into a scrape of that sort..."
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