During the Congress of Vienna (1814–15), the relationship ended, as Wilhelmine didn't like playing the role of an unacknowledged mistress, a role forced onto her as Metternich was married, and also because Alfred Windischgraetz (alternative spelling) appeared in Vienna, and she could not resist resuming her affair with him, writing "with friends one counts the days, with you I count the nights, and I would not wish to miss a single one of them". This distracted Metternich at a critical stage in the negotiations.