I would say its the opposite really.. I hated my ex. I kept hating him for a year for a year after we split. When i was no longer angry at him for what he did i realised i had gotten over him and i just didnt care all that much anymore. So for me, when i stopped hating him i was over him. I think the anger you feel is the fact that you still love them and care and angry because you arent together and that the promises you made to each other were broken.
I am going through a breakup/bad relationsip. And sometimes i hate him and feel angry, i know its because i still care about him in some f*cked up way.
For the relationships that didnt work and i didnt really 'love' them. I didnt really feel all too much anger after their breakup at all. And now are just friends.
You have all the weapons you need... Now fight!