What should I do if my happiness depends on a woman who doesn't care about me as much as I do?

Please, don't only say to move on... I would done it before if it were that simple
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Thank you all for sharing your opinions, after reading every single opinion, I think the best is to combine your ideas. First of all, my happiness shouldn't depend on another person, I need to toward on myself at the same time, I must become more attractive as a person in every way. Thank you very much!
What should I do if my happiness depends on a woman who doesn't care about me as much as I do?
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