In that case, there was indeed a mistranslation, though the actual rendering was only slightly less noxious than the errant one.
Call him the Good Husband, seemingly as steadfast beside his errant mate as is the proverbial Good Wife.
The errant flashes of light in your brain depicting this possibility are strong enough to make you wince and want to cry.
mid-14c., "travelling, roving," from Anglo-French erraunt, from two Old French words that were confused even before they reached English: 1. Old French errant, present participle of errer "to travel or wander," from Late Latin iterare, from Latin iter "journey, way," from root of ire "to go" (see ion); 2. Old French errant, past participle of errer (see err). The senses fused in English 14c., but much of the sense of the latter since has gone with arrant.