What does it mean if a guy starts calling you pet names?

Katie21
me and this guy have been talking this summer we text like everyday pretty much. and he calls me babe, baby, sweetheart, sweetie, boo so does that mean he's wanting to move up a notch or what? I call him pet names back :)

but do you only call girls those if you really like them?
What does it mean if a guy starts calling you pet names?
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