When girls constantly look at a guy's lips?

Anonymous
I've noticed some girls look at my lips when I'm talking to them. I'm sure some of them just do it without it meaning anything special, but there's sometimes when I feel there's something behind it. For instance, there was this girl who I was really into and when I talked to her, she would look at my lips every 5 or 10 seconds and then back into my eyes. What does it mean if it happens more than once or twice during a conversation with a girl?
When girls constantly look at a guy's lips?
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