What does it mean when a guy keeps sneaking glances?

Anonymous
This guy keeps sneaking glances from the corner of his eye when he thinks I'm not looking, but I still notice. I'm too chicken to look at him most times. He also keeps touching his lips and scratching his face/cheeks while he does it. I have talked to him before a few times, so it's not like we're strangers! I just don't get him.
Updates:
+1 y
Would it make any difference if this happens when he's sitting in front of me and turns his head every minute to look? (it's happened like 15+ times in a 10 minute period)
+1 y
Any suggestions of what I should do next? Stare at him? See how he likes it? haha
What does it mean when a guy keeps sneaking glances?
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