When guys go out of their way to speak to you, is this just human decency or flirty behavior?

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Just for context every time I go to the library there's a guy who he can't be attending to another person or speaking with someone yet with comes and starts engaging, even when there's someone helping me already. He's pretty friendly and tries to give more conversation. This also happens out of the library as well. We don't have any common friend just go to the same university. I think he wants to be "seen".
When guys go out of their way to speak to you, is this just human decency or flirty behavior?
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