Fiancee calls me his rib?

What does it mean to a guy when he calls his girl his rib? 😆
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Initially when he called me his rib, I googled it, and I found this song from Nick Cannon. I didn't thought of the religions meaning, because he believes in god but he doesn't practise his religion that much. Then I asked him about it, and he slightly mentioned the song, but he kinda talked around the subject than to answer my question. I then suggested the religious meaning, and he didn't confirm it. The conversation went on, and I never got the chance to dig into it.
Fiancee calls me his rib?
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