He started calling me “babe” what does this mean?

I’ve been dating this guy for a while now, he has never called me babe or any pet names before. I remember at one point early on, I accidentally called him babe and he just smiled but never said anything. And last night while texting, he said “i’ll speak to you tomorrow babe”. And I got so confused.. today I was speaking to him on the phone and he was saying it again… I’m 24 and he’s 32.
He started calling me “babe” what does this mean?
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