What does it mean when a guy keeps observing me across the room, and mimics my actiosn?

Anonymous
I didn't realise he was observing amd mimicking until I friend told me when he has left. For eg when I rest my hands of my cheeks, he did the same thing. When I looked down or smile or turned my head or lips my lips or change to a serious facial expression, he did the same thing tooo...

What does it mean if you do that to a girl?
What does it mean when a guy keeps observing me across the room, and mimics my actiosn?
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