Guys, if you look at a girl while she's talking to you and lick your lips, it is a sign of nerves or attraction?

Anonymous
We study together, recently became friends, and I have noticed that every time I talk to him he licks his lips and his eyes go really big/ wide

He doesn't lick his lips around others though. I also don't think him licking his lips is a conscious behaviour, I don't think he realises he does it around me.

But it makes me wonder if he's just nervous around me or its a sign of attraction
Guys, if you look at a girl while she's talking to you and lick your lips, it is a sign of nerves or attraction?
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