According to the screenwriter the whole movie was the span of one month. No one says that to someone they seemingly haven't had sex with.
shyt even if they had its still
That line is delivered AFTER the hug at the site. I just got back from a second viewing, and he asks her that question in her home, seemingly at least a bit into their relationship.
Even so, the line doesn't bother me because it is exactly how she would hear the question regardless of how either of them brought it up.
The movie is elevated on a second watch, imo. Everything comes into focus even more. Incredible film.