What exactly does it mean when a coworker calls you his work wife?

Anonymous
Coworker (2 months) and I are totally into each other, but he has a “girlfriend” thats really just consistent sex, so he said. He and I had the talk and I let him know we can only be friends no chance of anything else right now since he’s not single and I still wanna get to know him. We flirt all day everyday. And he calls me his work wife.

does he think there is a chance at sex even tho we already talked about it and I told him no sex?
What exactly does it mean when a coworker calls you his work wife?
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