I was willing to give her what she wanted... why is my ex girlfriend no longer interested?

After being in the relationship for nearly 5 years, she left me way back in March. I know the reason she left. She stupidly took her for granted to the point she got exhausted.

In the following month, I tried doing the right thing. I showed up unannounced, knocking on her door. I've never done this before. It was for a valid reason. This was her answer: ''Why now? I would've said yes before. I don't want it anymore. No you're not the one.''

A few weeks ago was my 2nd and last attempt. She declined me again, claiming to no longer be interested in me nor what I had to offer. She wanted nothing from me but wished me luck in my next relationship. I was left speechless at her radical, sudden change. Why?

She wanted commitment. Ok I made mistakes but tried to fix things. I don't get it. Why won't she be interested anymore? It was an expensive, green Sapphire gemstone. Sapphire and color green is her favorite and she declined that twice. She was crazy about me, wanted a future with me... why the sudden change?

Updates
4 mo
I don't get it. Supposedly she was hurt, felt unloved, taken for granted and that I would never commit. Ok got it, understandable.
I proposed twice and she declined me twice. What's going on?
I was willing to give her what she wanted... why is my ex girlfriend no longer interested?
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