Why Are Libras So Cold & Confusing?

I don't believe in Zodiac Signs too much, but after reading so much about my sign, A Gemini, I've being having some second thoughts about "Believing" in Zodiac Signs.
I like a Libra, It's been like that for five months, but I've known him for two years. To cut this short, I don't know, but If Gemini & Libra's are so "Compatible" in Zodiacs, why is he so nice, yet so cold at the same time. He always picks up a fight with me, then when he gets me upset and I decide to Ignore him, he realizes and tries to gain my attention. I mean, It's so frustrating, and I mean, I can't even get over the crush, no matter how much I try. His just so goofy and stupid.
I need help. I try with him, and sometimes, it's like he doesn't remember any of our conversations, nothing..
Why Are Libras So Cold & Confusing?
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