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You won't kill her attraction, you can forget it. Doesn't matter how needy you act. You won't be able to play it congruently especially if you have the upper hand.
Tell her what you wrote here to us. Exactly like that. Tell her you have concerns about loosing attraction because of her behaviour and if he can't change than you two have a problem. You want her to change don't you ?
If you don't want the relationship no matter if she changes or not, tell her that you are not in love and break up. The sooner you do it, the less hurtful will be for her.
If a girl is addicted to you, there's a high chance she'll turn into a stalker this way. I've brought down my stalking problems to almost zero by killing a girl's attraction first.
If she's not addicted to you, AFCToTheMax's advice will work. Only you can calibrate the situation for what it is. We can only evaluate what you wrote here. So if there are missing pieces of information or your description is vague, then the advices you'll get here will only go as far as the quality of the information that you have provided.

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Approach. Open. Escalate. Isolate
Here are my two essential rules on texting that will save you tons of time and money:
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