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Maybe when I used the word "Ultimatum" I didn't clearly express myself. I actually meant if she doesn't want to come after second chance then I would tell her that I am striking her off my life and then I ll move on.
That's probably worse than giving her an ultimatum up front. It's petulant and reactive.
blondguy is giving you solid advice on how to approach this situation, and in no way does it involve attempting to manipulate her, which is both what an ultimatum and telling her what you propose would be. If you're not going to call her anymore that's fine, but why tell her about in such dramatic fashion? I'll tell you why, both to hurt her feelings for hurting yours (by rejecting you, even indirectly) with the added bonus of making her feel guilty so maybe she'll reconsider her decision (unlikely but who said vindictive feelings were sources of truth in the world).
My vote is for you to do what blondguy suggested, but more importantly think about why that course of action is the right one. I'll give you a hint, it isn't the right one because it increases your chance of getting with her, even though it accomplishes that.
Good luck man