What does it mean if a guy who is sitting next to you gets very close to your face?

A coworker tried to show me something on his computer while he was sitting next to me. He leaned in so close that his face was only one inch away from mine during the whole meeting. I've been watching him for a few weeks and he never did this to anyone else. Does it mean anything? I never encouraged him to invade my personal space or flirt with me.

What does it mean if a guy who is sitting next to you gets very close to your face?
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