Was it a coincidence?

There’s this guy I know who showed up at my workplace. He knew I was working at a secondhand store, local to my area. I think he couldn’t have known which shop I work in. I wasn’t specific when I mentioned working at a local one or that it’s two suburbs from my house. He’s not the kind of guy who’d shop at a secondhand store, so I did wonder why he was there. Am I right that it must be coincidental?

Was it a coincidence?
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