Guys, What could it mean if a guy rubs the back of his neck a lot when he is around/talking to you?

Anonymous
I noticed this one particular guy does it a lot around me and unless he has a really itchy neck which i dont think he does i noticed he does that. he also fixes his collar and his hair etc.. and fidgets i guess. but he has a girlfriend so i'm not sure he likes me. opinions?
Guys, What could it mean if a guy rubs the back of his neck a lot when he is around/talking to you?
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