i have problems with my girl friend

i' ve said goodbye to her. Because of many faults that we have made. She told me that i had not cared about her. But i did my best, i have my working but i save almost my time to beside her. However, honesty, we have own working. she is still studying and me too. She blame on me and i also recognize that she had not cared me too. Many time i feel lonely even i be with her. is that we are tired together? I think that if i ask her healthy one time, she didn't want to tell me. I would not ask again. I am not a sentiment person. But maybe she like that.
now i am so sad. from now to after days, i will become alone. She will never be my side again. I hope that she rethink and forgive me.