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.
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Gallery | Cory and Lea: A Romance Remembered