For Guys.... why do you get so moody?

Can someone please tell me why you guys get so moody? Well, not all of you, but most of you do! My boyfriend for example... in the beginning he was soooooo giddy and everything... now he has this mood about him where it's almost like this "macho" thing...hard to describe... but not like he was... He tells me he still has the same feelings and everything for me... it's just part of who he is...He is a Gemini... but the moods are crazy!
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Ok... with this mood... He gets this way very hard to explain. Somewhat like grandiosity and treats me more like a friend... I did tell him how I felt... he said that it's just him that his feelings haven't changed.. I don't know... very confusing
For Guys.... why do you get so moody?
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