He fills his life with certainties. Every morning he will have his tea and then he will see the same patients, prescribe the same remedies, and go upstairs to read the same medical magazines before falling asleep at the same time. He knows what to expect and sometimes it's like he knows the future.
She is one of the certainties. She is always nearby, always ready to help, always smiling softly. Maybe they would have stayed doctor and nurse forever, quiet coworkers, and maybe not, but one day she falls ill, and the fever will not break. He is distraught, barely looking at any of the town's other citizens, permanently by her bedside. His hands shake when filling other prescriptions, and the normally-quiet doctor slips into total muteness. For a while, the town prepares for a funeral, sure that she will die, sure that he will follow.
And then one day she can keep down her soup, and her brow does not burn touching hands. She begins to sit up on her own, and smile; he begins to regain the weight he'd lost, and speaks a word or two to others.
The day that she eats three meals and walks on her own, he knows that she is the most important thing in his life, the most vital. He tells her as much, and she blushes and returns the certainty of his feelings.
The day after that, they are married.
AUTHOR'S NOTES
I'm sure this one is easy to anyone who's played Mineral Town… Obviously, it's Doctor Tim and Elli! Don't you hate how in the game, his name is only Doctor? It's just weird, especially when the farmer marries him; you'd think they'd be on a first-name basis by that point. :)