I'm going to give up on a girl and break her heart twice
Why would you want to hurt this girl twice?
I didn't want to go out with her any more.
I'm sorry you are feeling that way, but you shouldn't break someone's heart. If you don't want to date her then you should talk to her and let her down easily. If there are problems, maybe it is something you can work out.
I'm not going to do that because, she got what she wanted. She knows how I feel. Good riddance her and her annoying voice and stupid ass.
It sounds like you are not happy in this relationship and shouldn't be in it if you are feeling this way.