Why do girls look away from guys when they are passing each other?

Anonymous
Sometimes walking around on campus I will see a girl from a distance as we are walking towards each other and as she gets closer she looks off to the side. Does she think I'm ugly or good-looking and she doesn't want to stare?
Updates
+1 y
Good answers everyone! So I take it that if they look straight ahead and ignore you all together means they aren't interested/don't find you attractive? But if they look off to the side, there might be some interest?
Why do girls look away from guys when they are passing each other?
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