Girl's Behavior

Why a girl seems interested but doesn't show it?

A girl started staring at me a loooot, she rally try many things to be around me. I replied her staring and look at her back. After some days I approached her and I asked her name, we started saying hi each other when we cross, so we talked again and she acts normal but the most time she avoids eye contact or doesn't look at my eyes so long. She always try pass near me or make me notice her, I asked her number and she wrote this in a piece of paper. I just texted her once for she see my number, she hasn't texted me yet. We have talked twice and she don't make long eye contact, she seems shy to ask me about my personal life. What should I do?

Why a girl seems interested but doesn't show it?
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