I really enjoy the romantic reunion trope in fiction, primarily because of the emotional heaviness of longing and regret.

The books I like span different genres:

Classics like Persuasion by Jane Austen or Middlemarch by George Eliot, modern historical romance like Duke of Shadows by Meredith Duran or Not Quite a Husband by Sherry Thomas, the Outlander series by Diana Gabaldon, or urban fantasy like Blood Heir by Ilona Andrews or One Foot in the Grave by Jeaniene Frost.

What are other books that employ this trope in a satisfying way?