Why would a guy act moody around a girl he likes?

Cheer99
Why is it that some guys (I know not all guys) act a little bit moody around a girl he likes. I've had this happen to me and my friends all the time when we think a guy hates our guts and that they seem like they are trying to avoid us when we really find out they like us. Why do some guys act like this? Why don't they act friendly to show they like us?
Why would a guy act moody around a girl he likes?
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