What does it mean when a guy runs his fingers through his hair ... while talking to the girl?

shuba
does this mean anything. the other day I was talking to a guy. we are good friends. but for the first time I noticed him... while we were talking. he ran his fingers thru his hairs.

is it something casual... or what does it mean?
What does it mean when a guy runs his fingers through his hair ... while talking to the girl?
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