When did you first call your boyfriend/girlfriend babe?

So I know this sounds like a totally stupid question, but I haven't dated in 4 years. So this whole dating thing is new. He calls me sweetheart, beautiful. I call him handsome, but not all the time I want him to know Im not just saying that to be saying something and I mean it. So when do you call them babe? Or is calling them babe not a "thing" to do anymore?
When did you first call your boyfriend/girlfriend babe?
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