Hemingway is so talented in picture the whole story using very limit word.Although he has not yet give us the image of the character,we can sense the romantic relationship in just a few words.
He is so considerate that he don't want to bother her to take temperature for him though he is still not recover yet, which mirror the fact that he loves her deeply.
It obvious that that the man loves her,he didn't want her to bear the pain of getting up at midnight so he did what he could do after he got on crutches.