Somewhere in Time has remained a romantic favorite since it first hit theaters in 1980, but it turns out the real love story went beyond the one on screen.

At the TCM Classic Film Festival this past weekend, Jane Seymour opened up about her and costar Christopher Reeve falling hard for each other while making the time-travel romance. The actress has long spoken of the enduring friendship she and Reeve cultivated on the film but has rarely discussed their romantic relationship.