Why does he wear a wedding band if he said he's single?

Any men here wear a wedding band but aren't married? I met a guy at work and he wears a wedding band. I assumed he's married but when I asked about his spouse he said he's single... I didn't want to pry into his business and so I didn't ask why the wedding band but curious if this is a thing for another reason?

Why does he wear a wedding band if he said he's single?
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