What does it mean if a stranger guy gives chocolate?

First time he asked my co-worker to give it to me , the second time he gave himself.

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His behavior is like "hot and cold". A few times I have seen him look back over his shoulder while walking away. He has said hello with a smile. One time he looked at my face for several seconds while walking by without saying anything. He hasn't said hello anymore, but when he looks at me, he seems very serious
What does it mean if a stranger guy gives chocolate?
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