When the Gardiners meet Mr Darcy in the company of Lizzy at Pemberley she is relieved to have “some relations for whom there was no need to blush.” Swiftly Mr Darcy brings his sister to meet them and the Gardiners recognise “that there was no other way of accounting for such attentions from such a quarter than by supposing a partiality for their niece.” During the visit they determine that Mr Darcy “was overflowing with admiration” for Lizzy, concluding with “it was evident that he was very much in love with her.”
Mrs Gardiner wishes to know the full truth of the matter especially when it appears Lizzy has told Mr Darcy about Lydia’s elopement (a circumstance they would try to keep as secret as possible).
Oh, that I knew how it was!
Both Gardiners consider there was some sort of understanding between the two or “would never have yielded” to allow Mr Darcy to organise Lydia’s marriage.
Video from Pride and Prejudice 1995 / Audio from Cassandra by Taylor Swift
The last line of the novel is devoted to the Gardiners:
With the Gardiners they were always on the most intimate terms. Darcy, as well as Elizabeth, really loved them; and they were both ever sensible of the warmest gratitude towards the persons who, by bringing her into Derbyshire, had been the means of uniting them.