Why did my ex block me?

A man who I was involved with at one time contacted me. This man can't give me what I need or want. I've asked and he cannot. So, he contacts me and wants to offer me not what I want, continuously. I told him that he can't offer me what I want and I was going to try this new relationship and told him I was going to have a great summer. He told me you have a great summer then. I go back to reply thank you. And , I'm blocked.
Please people Why. ?
Why did my ex block me?
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