Why would she just disappear?

I dated this girl for about 8 months. After about 3 months she broke up with me saying she just wanted to be friends. A few days went by and she came back and said she made a mistake. We went out a few times and we said we loved each other. Eventually she started making excuses why she couldn't see me and then just disappeared. About a month later she sent me a text saying she felt terrible about it and wanted to see me again. I fell really hard for this girl so I agreed to see her. She said she goes hot and cold because she is afraid of getting dumped.(not sure I believe that) We started to date again but then eventually she disappeared AGAIN. I was stupid enough to let her back in! If she doesn't want to see me again why doesn't she just tell me? I'm not sure if there is another guy involved. Does anybody have any idea why she would act like this?
Why would she just disappear?
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