Why did this girl ask me if I live alone?

A girl I know from the gym asked me if I live alone the other day when we were chatting. One of my female friends told me it's a strong sign of interest if a girl asks if you live alone, i. e. have your own place.
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Today I saw the same girl and she waved and didn't come talk to me.
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bumpage
Why did this girl ask me if I live alone?
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