What does it mean if a guy asks if you have a boyfriend?

Hi there is this guy at my work and we talk sometimes but not a lot. The other day at work he came up to me randomly and asked if I had a boyfriend and after didn’t say anything else and just went back to working. What does this mean? Do you think he is interested?

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Some people are saying he could be asking for someone else, but how would I know if he was asking for someone else?
What does it mean if a guy asks if you have a boyfriend?
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