She Must Be Seeing Things (1988)
Plot
Agatha, a globe-trotting attorney, and Jo, a documentary filmmaker, share a passionate romance. But when Agatha stumbles upon Jo's private journals during one of her frequent trips, she can't resist reading them. This invasion of trust ignites a dangerous spiral—jealousy takes root, and their intimacy twists into a consuming, obsessive fixation that threatens to destroy everything they have.