Why did he look at my forehead instead of my eyes?

Anonymous
I saw my crush and I said hi to him. I referenced a comment he made a while back and I could tell he really liked it because he smiled really big but he didn't look at me. When I was trying to talk to him he was smiling a little but not looking at me, but he seemed engaged and not bored or anything like that.

He asked me a question and kind of stared down at his hands and when he looked up he was smiling at me but looking at my forehead.

Is that a common thing for guys to do if they're feeling shy or something like that?
Why did he look at my forehead instead of my eyes?
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