Why does my ex say he hates me?

So about a year ago I got dumped by a guy I really liked and he and I talked a while post break up. He did tell me he hated me and every once in a while i never understood why though... He texted me twice this Summer once in July and once in September he blocked me after he was done texting every time. This year he doesn't even look at me we don't talk anymore but when I did make the first move for texting him he told me he didn't want to say anything to me and to leave him alone so I have been. Anyway he told me sister he hates me when she asked why he said I don't know im really confused why does he say he hates me. He doesn't even know why :/
Why does my ex say he hates me?
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