Sadness

After 1 year and 4 months my gf broke up with me. Our relationship has always been bad, since the very beginning. There was mental and physical abuse and also cheating. I know all these things may seem awful but I really believe things could be different. She’s a good person but she doesn’t know how to express herself the right way. I think she acts out because she’s struggling and that’s an easy option for her. I know that things can be better I’ve put so much energy and effort into our relationship and towards the end of it I asked her what effort has she put in this and she got upset and said she can’t answer that. (because she hasn’t put in effort) I miss her so much already, I know we have the potential to be better so what do I do?