I got left on unread again?

joblot
So my ex girlfriend and me and have been chatting on and off for a while. It goes ok until all of a sodden she disappears and ignores me. We chat on messenger but she still posts on her social media.
she will then reply sometimes hours, days or now weeks later and even start a new conversation with me and then deliberately ignore my reply.
for example. Just before Christmas she was talking and seemed very upbeat (more so than previous but she was a lot more open towards me after a while. ) then all of a sodden she ignores me for five days and comes back to reply to me and start a new topic of conversation. I reply a few hours later and then she again leave me on unread and has ignored me ever since?
I really don't understand why she does this. Can any girls or guys explain this behaviour.
i must Add I never get back in touch with her again until she replies to me. It's not as if I'm nagging her constant, I go quiet when she leaves me on unread.
I got left on unread again?
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