Alice Munro 
Floating Bridge (Storycuts) 

A consultation with an oncologist disrupts Jinny”s resolutions and resignations, and she must confront issues she”d hitherto been content to let lie. Leaving her husband to his distractions, she allows a strange boy to drive her home by way of an unusual road.
Part of the Storycuts series, this short story was originally published in the collection Hateship, Friendship, Courtship, Loveship, Marriage.