Evidence that it works out — and how.
Advice is abstract; stories are specific. This collection gathers accounts of relationships that worked, told with enough detail to be useful: how people met, what they were doing differently by then, what they nearly got wrong, and how long the unglamorous middle part lasted.
Read enough of them and patterns emerge. Most people describe a period of deliberate work beforehand. Most describe being clearer about intent than they had previously been comfortable with. Almost none describe a story that looked like a film.
The point is not inspiration for its own sake. It is calibration — a realistic picture of what the process looks like from inside, which is the one thing advice articles cannot give you.