Is he interested or just being nice?

So I work with this guy, and I can't tell if he's interested in me or is he's just being nice. I work in retail as a cashier and he's a merchandiser. We've only known each other for about 5 months. It seems like he always finds a reason to talk to me, like asking me where something might be when he's working on a check list or telling me about his new tattoo. He even asks me his opinion on his appearance, like how his hair looks or if it looks like he's gained muscle. I can't really explain it, but he's always smiling and he's even complimented me. Am I reading him wrong?
Just being nice
Hard to tell
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Is he interested or just being nice?
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