If Allah exposes some sin of someone, does it mean Allah hates that person?

I basically have three questions but they are of the same type and are related to one another. First of all I want to know if Allah exposes some sin of someone, **does it mean Allah hates that person and that person is doomed?** Secondly what if that person decides to change himself, **does it mean that it was good Allah exposed that person for the betterment of his afterlife?** Thirdly, **does Allah expose some sin of people in this world to punish them?**