Till Human Voices Wake Us 2002 on netflix

Sam and Silvy are best friends. One night, as they are watching a falling star while floating on their backs in a lake, Sylvy disappears from his side. Despite his best efforts, he cannot find her under water. Many years later, Sam, now a psychologist, returns to bury his father. Back in his hometown, he meets a woman called Ruby who reminds him in so many ways of his lost love.