In 2373, Worf developed par'Mach for Grilka, but was unable to pursue her because at the time he was regarded as a traitor to the Klingon Empire. Instead, he helped Quark conquer Grilka's affections, and eventually realized that Dax was a much more suitable (and attainable) mate. (DS9: "Looking for par'Mach in All the Wrong Places")
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