Petite menteuse (1998)

Take a handsome, friendly 40-year-old family man looking for a job. Put him in a room with a young executive woman, who's single, resolute and yearning for motherhood. Add a delightful little pony-tailed siren named Laura. Sprinkle with smiles and tuck into a charming tale... It's just that delightful little siren sometimes turn out to be terrible liars and a young "widower" can conceal a happily married man, wibly in love with his wife. Trouble's brewing...

Unfortunately the movie Petite menteuse is not yet available on HBO Max.