Why do girls flake?

I think I dated this girl a couple of times. I went to the movies with her once, and to starbucks for once, and I also went to her house to help her with the class we were taking together.

Now after awhile, after the class ended, I called her to make plans, and she flakes on me. She doesn't answer any of my calls, she doesn't call me anymore just to talk, and I'm really confused about what happened.

Any ideas?
Why do girls flake?
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