Why do guys run their hand down a girl's face?

What does it mean when a guy runs his hand down a girl's face? Like his hand starts at the forehead and runs all the way down, I wouldn't call it gentle but it might be according to them. This happened to me with two different guys. Do they think I'm pretty? Is there a hidden meaning? Please help!
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+1 y
two of my guy friends have been recenetly been doing this to me as well
Why do guys run their hand down a girl's face?
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