What more could she have to done to say she is breaking up with you than what was detailed of her past behavior.
If you had 100% chance of her coming back with open arms you still have to work through
1)the addiction
2) past behaviour of cheating and dumping you out the blue -while engaged!
3) and now as you keep trying to evidence the added element of narcissism.
4) selfcentered and using people when its in her benefit.
If I made a list of traits to run from then I would list the above. If I had to search for the top traits I do not ever want to be in a relationship with it would be the above.
You had a great relationship, you still love her but if we only worked on how we felt on the past then no one would get divorced because we dont marry people we want to divorce we marry who we want to stay with. You divorce the person you have today. The past is over.
You fell in love with someone that won't/cant give love back to you. That is what you should focus on. Why and how to move past it.