Why does a guy blocks a girl without telling her any reason even though she doesn't express him any love and treats him as a friend?

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He is in love with her. He knows that she treats him like a friend and expects her to understand his feelings. She doesn't understand and instead friendzones him. He is finally fed up with her and blocked her after she continuously calls him as a friend and he assumes that she doesn't love him back. Is this a valid reason from him to block her? Is it over and never the same after he blocks her?
Why does a guy blocks a girl without telling her any reason even though she doesn't express him any love and treats him as a friend?
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