Warning: spoilers ahead for The Summer I Turned Pretty season 3 finale. Yes, we'll always have summer, but The Summer I Turned Pretty is officially over. The Summer I Turned Pretty season 3 finale aired on Wednesday, September 17 with a runtime that was damn near movie-length. So, how did The Summer I Turned Pretty season 3 finale end? Eddy ChenThe Summer I Turned Pretty season 3 finale, which also served as the series finale, ended with Belly and Conrad finally professing and accepting their love for one another.