 The Duchess of Lorraine 's love for her husband was strong and possessive . The letters she sent to him shortly before their marriage expressed her eagerness to see him ; his letters , on the other hand , were stereotyped and formal . She was very jealous of her husband and his infidelity was the greatest problem of their marriage , with Maria Wilhelmina , Princess of Auersperg , as his best @-@ known mistress . 
