Count Your Blessings (1959)

Englishwoman Grace Allingham marries Frenchman Charles Edouard de Valhubert, but their marriage quickly becomes unusual. Because Charles cheats on her and lives away from his family out of professional obligation to his government, Grace ends up raising the couple's son, Sigismond, on her own. Grace and Charles are finally reunited after nearly a decade apart, and, while they seem headed for a permanent split, there's still a spark between them.