How to get a Leo girl's attention back? Any Leo girls out there?

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Long story short. This 'shy' leo girl had a crush on me 3 years ago. She gave me a lot of signs but I was actually chasing another girl back then so I kinda ignored her signs, thought i was nice to her. She completely stopped talking to me after all that for about 2 years. After 2 years, we started talking again. She again showed some signs of interests. But I had another girl in my life this time as well, so i tried to be just friends with her. As soon as she found that out, she stopped talking to me again. That kinda pissed me off.
After 6 months, she starts smiling at me again. WTF! I ignored her badly. Very badly. She tried to talk 2-3 times, but then she realized. THEN she started ignoring me like hell, she un-friended me on FB. She acted as if I don't even exist. I don't know why, but that made me feel highly attracted to her.
I really want to talk to her now. I haven't tried talking to her but I wonder if she'd actually talk to me now. What should I do? Should I give up and move on or try talking to her once? What reaction should i expect? How bad is ignoring a Leo girl?
i am a pisces btw.