<human>: Can you give me a shortened version of the text?

(Sorry for my bad english, i´m not native)

I´m dating my girlfriend since 8 months ago. She is a very mentally unstable person. Had problems with burnout once. She has enormous fear to be left. When i´m with her, everything is fine. But when i´m at my home, and she´s at hers, things go down. 
For Example: A few days ago, she phoned me in the morning to ask if im going to see her in the evening. I had to decline (had to work in the evening). She started to argument in every way she could think of, to convince me otherwise. After one hour of pointless arguing, i had have to hang up without agreement (she refused to say goodby). Until evening, she phoned me !!60!! times and send me multiple messages in which she told me, how terrible she was feeling at the moment. In the night, she had to go to the hospital because of a circulatory collapse and had to report sick at work the other day. 

Stuff like this happens every few days (not every time in such an extreme form). 

She loves me. 
She adores me. 
She is mentally unstable. 
She uses her unstability to force me to see her far more often than i would so freely.
She is not a bad person. Just a very weak an a very very anxious one.  
I like her, but i don´t love her. And i have to break up with her. 

I´m looking for a way to break up with her with doing as few as possible damage to her. I don´t have a clue how to do so, without destroying her completely. 

When i´m breaking up with her, i have to put her on every ignore-list i can think of, otherwise she would call and message me nonstop (literally nonstop!). This will brake her heart. Fuck. I don´t want to do that, but i have to. 

Any advice would be really really great.
<bot>: My girlfirend adores me and thinks, she can´t live without me. How can i break up with her in the least damaging way?