Girlfriend is talking to a male coworker, should I be worried?

Before anyone gets upset, I'm not mad at her for talking to male coworkers.

I don't know any of their names bar one who she's told me "He's hilarious".

She gets in touch with every day just to say Hi and spark a conversation.

I'm getting worried there might be something there?
Girlfriend is talking to a male coworker, should I be worried?
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