<human>: Give me the gist of the text in a nutshell

As stated in the title, we broke up after over a year of dating. The reasons behind the break up are not necessarily important, but it was essentially my fault. She was not perfect either, but I never used her mistakes against her. I know for a fact that she still loves me and has feelings, but does not actually think that I have changed. Although I have done everything in my power to change the person I was and make myself better for both her and everyone around me, she has told me that it is too late for her to give me a second chance.

 Is there anything I can do to win her over or at least open her eyes to giving me another shot at making things right? I love her and do not want to throw everything that we had away. I realize my mistakes and do not ever intend on making them again. I want to be the best I can be and the breakup is really killing me inside. I think that everyone deserves a second chance, especially when I didn't cheat on her or anything like that. Has anyone ever been in a similar situation? I would appreciate any advice that anyone has on the subject.
<bot>: My girlfriend dumped me for certain reasons and now that I have acknowledged my shortcomings and fixed them, she says it is too late to try again. Is it ever too late? Any ideas on what to do?