!!! SPOILER AHEAD !!!
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That's what Alex wanted to do: to have the courage to tell Mina about his condition while saying good bye to her and wished her for a happy life. But the story happened exactly because he didn't have the courage to do it. He thought it'll be easier for both of them if Mina just hate him and leave him, but it didn't cross his mind that what he did (just broke up with her without telling her anything) ended up putting Mina in years of guilt.
In the end, we wanted to make (sort of) happy ending for both Mina and Alex and hoped that the readers will be satisfied with it. Thank you for playing EDDA Cafe! ^^