The 31-year-old Glee actor was planning a special surprise for girlfriend Lea's upcoming birthday on August 29, UsWeekly reports.
"She didn't know what," a source tells the mag. "But she thought it could be a party and possibly a trip somewhere."
It's clear that the twosome was going strong and totally in love before Cory's tragic overdose on July 13 from a combination of heroin and alcohol.
In an interview before Cory's death, Lea called him "the best person I know." She even told one friend that "Cory is the One", according to UsWeekly.
The costar couple reportedly had planned to move in together to Lea's LA pad.
Stay strong, Lea.
Gallery | Cory and Lea: A Romance Remembered