There are reportedly two endings,one featuring a happy one,like Duvivier's "La Belle Equipe" .I have seen the sad version.
Henry Decoin was mainly known for his films noirs."Les Amoureux sont seuls au Monde" rather belongs to the melodrama genre.A famous composer (Jouvet) helps a young piano virtuoso make a career.But he's getting old and the gutter press begins to write saucy lines about how the girl makes him feel younger ... and in love.Unfortunately he is married and he dearly loves his wife.
My favorite parts are the long prologue and the epilogue:they both take place in an inn and in a forest where Jouvet sings the old love folk song "A La Claire Fontaine" which goes on repeating "IL y a Longtemps Que Je T'aime "( = I've been loving you for so long).
Prologue:there's a wedding at the inn and they have no musician;so they ask the earnest composer to play popular tunes so the guests can dance.Then the musician and his wife take a walk in the forest where their love seems to be forever.
Epilogue:Jouvet comes back to the inn after the tragedy.He does not tell the owner about what happened .Then he and his good friend go away in the forest..
Bertrand TAVERNIER used one of the lines of the dialog to open the ten episodes of his "voyage dans le cinema français" series
