Why won’t my partner call me babe? Or any other pet name?

I’ve been on and off with my partner for around 5 years. At the start we used to call each other babe but now he doesn’t he just calls me by my first name. I’ve brought it up a couple times saying “stop calling me (*my name*) I feel like a stranger. Call me babe or something”. He will maybe once but then go back to calling me by my first name. Why?

Why won’t my partner call me babe? Or any other pet name?
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