Girls, why does she block and unblock me?

Me and my ex split up 3 years ago, she actually left me. And got into an array of relationships with other guys. I was her first boyfriend she ever had and she lost her virginity to me and stuff. We was together for nearly 4 years.

But ever since we split up 3 years ago I have moved on , I am now at university. But I noticed that my ex girlfriend keeps un blocking and blocking me on Facebook. We are not even friends and haven’t spoke for 2 years. She keeps blocking and unblocking me why is this?
Girls, why does she block and unblock me?
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