What is up with this girl?

I don't know what's wrong with this girl. She is utterly confusing me now. A long time ago, I met this girl on Facebook, and she was cool. We texted each other, and it seemed like we liked each other. But she made it clear she just wanted to be friends. I was heartbroken but cool with it. We still kept talking and helping each other out with things. One day she asked me for advice about someone she likes and said that the person she likes is open to dating other people, including her too. I didn't agree to that, and she got mad. She deleted all her accounts, and for two months, I felt bad. I texted her, told her I missed talking to her, and suddenly, she came back on social media. I was happy, and everything was going fine. She said she also needs to find a new job and a home, and she will feel like herself again. Now a month later, she starts acting funny. She stopped posting, and today she deleted her account. I suspect she has another account I'm following but isn't sure it's her. She keeps weirding me out. Things would be fine, and then she acts like this. To be honest, I'm getting annoyed. What should I do?

What is up with this girl?
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