Hello!
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Is there any chance to rekindle the feelings if I become the person she fell in love with three years ago again?
The thing is, you will never be the person you were three years ago again(!) Time has passed. You have changed. So there is no going back. And the very idea is quite questionable.
Look at it this way. The girl has seen you over the course of several years. She noticed things, hoped for certain things, and expected certain things. Over time, her feelings for you did not turn into love. You need to acknowledge that. And, by the way, you need to learn to respect yourself first and foremost. And respect the girl’s decision.
You cannot truly control another person’s feelings at a deep level—you might evoke some emotions, but that’s about it. You cannot step into the same river twice.
It’s clear that the issue for you is that you still can’t accept the fact that the romantic relationship has ended, because you still have feelings and hopes. And the girl’s words—
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"I beg you, learn to live without me. We will never be together. I no longer believe in it, I no longer feel anything."
—only stir your heart even more and seem to challenge you: prove that you are worthy of being loved.
If you accept this challenge, it means you are taking the wrong path. This path is tied to catering to another person’s needs at the cost of sacrificing yourself. Not literally, of course. But you lose your self-respect and a sense of healthy autonomy. You drift toward emotional dependence with all its negative consequences.
So my recommendation is to focus on yourself and on what happened in the relationship. What did you give to the girl, and what did you receive in return?