Why would an ex reach out just to ghost you?

Back story: My ex and I broke up over a month ago. And we haven’t been in contact. About a week ago he texted me. And I returned his text and he never replied. Also, I texted him 2 days ago asking for my stuff I letter over his house and he doesn’t want to give me my things back.
Why would an ex reach out just to ghost you?
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