When a guy says "Goodnight b" what does it mean?

Like for the past get night I've been starting to get a little "closer" to my guy friend and now he is starting to say "goodnight b". What does the "b" mean? Does it mean babe? Boo? Bæ? Baby? Like I'm confused. Please help
When a guy says "Goodnight b" what does it mean?
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