husband calls play partners by his polish pet names without realising and i dont know how i feel

so. he's polish born, moved to leeds in his late teens, fluent english obviously but the bedroom stuff is half polish half english always has been. weve been together 14 years, in the LS three years, both early 40s. he calls me kochanie and skarbie and a few other things and i love it, its part of who we are. problem is. he uses the same words with play partners. and i clocked it for the first time properly at a house party last month, he was with another woman in the next room and i could hear him calling her skarbie. and i sat with my drink and felt something i wasnt expecting which is, the words felt less mine all of a sudden. i talked to him about it on the way home and he was genuinely shocked. like he hadnt noticed, said it just comes out, said its not him "using our words" its his brain defaulting to polish when sex is happening, regardless of who its with. which i believe. he was upset that id felt like that. now we're in the bit where we have to decide what to do. options seem to be — he tries to stay english with others (which feels artificial and might affect his actual enjoyment), we agree certain words are mine only (which feels weirdly bureaucratic), or i just get over it (which i don't think i can actually choose to do). anyone done this calculation in their own bilingual relationship.