What does it mean if a guy looks at a girl's lips and boobs while he talks to her?

Anonymous
For example, a guy sits in from of me at a table and he talks to me. As I'm really listening to what he says, and I'm not expected to talk, I make eye contact to show I care. And while talking, the guy stares into my eyes (I think this one is normal) then looks down at my lips and finally at my boobs. And he does it three times in the same conversation. Also, I don't know him very well.
What does it mean if a guy looks at a girl's lips and boobs while he talks to her?
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