How would you handle this situation?

I just started dating a guy who own his own shop. He is supposed to only work till 2pm on Saturday. Now it seems like he is always staying late on Saturday to hang out with a female employee. He once told me he was feeling too lazy to leave. Our relationship is new but im not very fond of his behavior. Should I address this now? Or sit back and observe his behavior over time? Thank you
How would you handle this situation?
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