Why did my ex text me “hello” then not answer?

The last thing he said to me was “you are negative and hateful and toxic. I don’t need you in my life. Good riddance”. Him saying that is ironic as he cheated on me multiple times. After that he blocked me everywhere and then unblocked me later that day. Then two days later he messaged me “hello”. I didn’t reply until a day and 5 hours later. I messaged him “why did you message me?” And he did not reply.

I am very confused.
Why did my ex text me “hello” then not answer?
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