I cheated and lost her. Please help :(

We had two years and me constantly treating her wrong and when I finally fixed my ways, it was too late 😞she wants to stay friends and stay in touch, and I can tell she still has feelings for me. But she’s already choosing to try and move on by talking to someone else. How can I get her to see my change? How can i prove that it won’t be the same if she takes me back :(