We have been dating for two years and things have been on and off good and bad. Currently they are good, as in the past 1 week, but I would rather end the relationship now instead of when we are fighting. I have thought about this deeply and finally i am settled on ending this. 
The problem is that she thinks I am "the one" and is convinced that we will be together forever. Whenever there is a hint of a suggestion that I have some kind of doubt, her emotions change completely and she accuses me of not loving her. I "broke up" with her about one year ago and she hyperventilated and cried for hours. I succumbed to her reaction and continued dating her and things got better. I am now ready to leave this relationship, but i expect the same reaction from her, if not worse. I expect to be yelled at, accused of not loving her, accused of lying, her having an anxiety attack. I don't expect things to be physical, so there is no physical danger. 

Any tips on how to 1. "ease" the bad news, and 2. handle her reaction?
user
I am going to break up with my girlfriend today and I am expecting a reaction from her, if not worse.
assistant
We have been dating for two years and things have been on and off good and bad. Currently they are good, as in the past 1 week, but I would rather end the relationship now instead of when we are fighting. I have thought about this deeply and finally i am settled on ending this. 
The problem is that she thinks I am "the one" and is convinced that we will be together forever. Whenever there is a hint of a suggestion that I have some kind of doubt, her emotions change completely and she accuses me of not loving her. I "broke up" with her about one year ago and she hyperventilated and cried for hours. I succumbed to her reaction and continued dating her and things got better. I am now ready to leave this relationship, but i expect the same reaction from her, if not worse. I expect to be yelled at, accused of not loving her, accused of lying, her having an anxiety attack. I don't expect things to be physical, so there is no physical danger. 

Any tips on how to 1. "ease" the bad news, and 2. handle her reaction?
user
Going to break up with gf today, she expects me to be mad, I expect to be mad, what should I
assistant