Has anyone tried to get there ex back?

Have anyone tried to get there ex back? My boyfriend loves me but he says ive been acting very badly lately. And i do believe him. So he is breaking up with me but is still wanting to help and is still giving me a chance to fix things. I just don't know what to do. Sometimes i feel im making things worse by accidently missing calls and fighting back. I need help and support rn because i love him soo much and i would do anything to be with him. I can honestly say he is the love of my life and i do wish to marry him one day.