Wife of Felix and Lucien's secret long-term lover; hired as a housekeeper by Lucien after he moves back to his own home, harboring a promise of eternal love to keep hidden.
Mathilde sees Sylvia's growing closeness to the widower as a threat to an established secret relationship.
The plot states that Mathilde distrusts Sylvia after Sylvia becomes close to the widower.
They are married, although their relationship is compromised by Mathilde's secret affair.
The plot explicitly identifies Mathilde as Felix's wife.
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