I manipulated my girlfriend to hate the love of her life
Why did you want her to hate the love of her life?
Because she was too stupid to see what a piece of crap he is.
I see you wanted to help her move on but manipulation is still wrong regardless of whatever good intentions you had. If you wanted to open her eyes to how awful he is maybe you should take a more direct and honest approach?
I have no sympathy. Little miss stupid better know that I did this for her own good.
It sounds like you're starting to veer into controlling territory where you believe you know whats "best" for your girlfriend. If you do this you will find that you are now a bad boyfriend who cares more about you want than you girlfriend. Sometimes its best to let people control their own lives and make their own mistakes.