What does it mean when a guy keeps making direct eye contact with you and not look away?

He looks at me regularly from across the room and lock eyes, but doesn’t turn away. I look too, because I like him, but he doesn’t smile, instead he just looks intensely and kind of serious I guess. Any clues to what he’s thinking or doing?

What does it mean when a guy keeps making direct eye contact with you and not look away?
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