Particularly since the details I remember are rather vague.
I know I read it online. I thought it was by Fitzgerald but my searches have come up dry. That doesn’t mean it wasn’t by F. Scott - just that I couldn’t find it - but perhaps it was by Maugham?
The synopsis as I remember it: A soldier (?) meets a precocious little girl (of the sort only found in short stories) in a cafe (train station cafe?). I think she gave him a watch. The end of the story is some sort of reflection on how much life sucks and how perfect the afternoon in the cafe was, even if she was a little snot.
I don’t expect to ring any bells on this but maybe someone will have a clue what I’m talking about…