Why do exes play games?

Why is my ex girlfriend seem to be playing games. For example the last two weeks she was messaging me on Facebook, then all of a sudden she stops and completely ignores me for five days then all of a sudden she replies back. Not only replying to my message but actually starting new conversation. I reply to her and again she ignores me and doesn't reply and hasn't replied since. She leaves it unread while posting on social media. It kind of hurts and I'm confused as to why.
i have previously asked to work things out with her, go for a coffee, meet up etc but to no avail.
so I haven't asked since.
please can any girls or guys explain why she is doing is she to me.
Why do exes play games?
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