From the answers here it seems as if I'm the only one with some actual experience. No offense though... My thoughts on this is that you should listen to her and learn from you mistakes. She did wrong by not reacting immediately, just playing along until she exploded, called "the ketchup effect" in psychology. But you must have done wrong by not putting any effort in your relationship. A relationship requires WORK, and you need to work hard to keep it alive! And it requires compromises. But that's an area not covered here, since this is a pickup community. I've been in a 10 year long relationship before, so I know that deal. And I barely had time to be single (and learn game) until I met my current wife, in an epic(!!!) pickup. So I know that deal too. (Just trying to sound trustworthy here).
My tip to you is to send her a text and say "You're right, we should not be together" and move on with you life, find someone else. I say so because I can tell she is not that important to you, from your post.
Good luck!