Things were getting hot behind the scenes on "Juno". In his new memoir Pageboy, Canadian actor Elliot Page reveals he had a passionate affair with actress Olivia Thirlby while they were filming the 2007 movie "Juno". [readmore label="READ MORE: " link="https://etcanada.com/news/996680/elliot-page-reveals-secret-romance-with-kate-mara-while-she-was-dating-max-minghella/" text="Elliot Page Reveals Secret Romance With Kate Mara While She Was Dating Max Minghella" /]…