Ex leaves me on read after sending me a message?

So my ex and I broke up and he left me on read and after a while I started talking to him and asked him to think of getting back together and he kept leaving me on read after a few messages and eventually I said I've had enough and I won't force him anymore I'm going to go and he left me on read , today he sends a message and we start talking fine just for him to leave me on read yet again, why would he do that?
Ex leaves me on read after sending me a message?
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