Elliot Page and Kate Mara Casey Flanigan/imageSPACE/Shutterstock; MediaPunch/Shutterstock Speaking his truth. Amid the many powerful revelations in Elliot Page’s upcoming memoir, Pageboy, the Juno actor detailed his past romantic relationship with Kate Mara for the first time. “The first person I fell for after my heart was broken was Kate Mara. She had a boyfriend at the time, the lovely and talented Max Minghella,” the Oscar nominee, 36, wrote…