For me, my gf left me because I'm having a hard time changing. I have outbursts when I'm black out drunk. I wish she would take me back like you want your bf back but you have to be honest with yourself. Even though it kills me that I can't be with her right now I know our relationship will never be able to move forward without me getting help. If he can't realize what I realize and is not willing to make the change you will have to be prepared to walk away for good. I support my gf with needing to have space and time away from me to change but there is no guarantee we will be back together but what I'll get from this is I will become a changed person because I want to be not because she wants me to be.