Gf problem pls advise :'(?

Im going through depression because of my gf.. she hurts me so much i hate myself! she says she needs time after one year of being together and then she says she needs me and then again she says she needs time, more like she thinks im some toy :( shes done this more than 1o times for this month :( and i just cant get over how much shes hurt me and things arnt the way they used to be.. sometimes even when shes in a good mood.. and when she wants to talk to me, i just dont talk too much because i know shes going to hurt me by saying somethng and she gets pissed about it and she goes off. She changes her mind every hour like and I hate her for that. I hate her as much as i love her. I just cant leave her :'( I need her ... and i hate myself for loving her so much.. and to be honest, wether my day is going to be a good day or bad day, is in the way she talks to me.. and i have hell a lot of bad days :'( but i love her :'( I always end up crying in bed at night :( i really dont know what to do.. how do i fix things up? :(((((