Thanks for all of your help and advice a few days ago. To give you a brief summary, I was having trouble communicating my needs to my friend, who has BPD. I felt that she was using our friendship as crutch and that I was getting frustrated and consumed with her issues. 

I recently changed around a lot of my hours and took on more responsibility with work, school, and in my personal life, and realized that I needed to take the time to mentally and emotionally support those activities. It was becoming increasingly difficult to do so with her constant emergencies and the barrages of texts she would send when she felt that her needs were not being met. I did not want to fade out, so yesterday, she said that she thought I had been awfully busy lately. I replied that I had, but that I also wanted to tell her that I needed more space in the relationship so that I could focus on my life outside of the internet. (We primarily communicate via text.) 

It was awful, to say the least. She was livid, sad, in utter anguish. My intention was to set a boundary and stick to it. I asked that we stick to setting times where we speak, or meet up and get together so as to focus on quality over quantity. I didn't want to end the friendship at first. I took your advice to heart, which I am vastly appreciative for. I don't think I would have been able to do this had it not been for this sub and for the people around me supporting this conversation. 

Ultimately, it fell upon deaf ears and she terminated the friendship, to the extent that I know. I have received many messages throughout the night and have tried not to argue any points. She seems convinced that, not only is this entirely my fault, but that the friendship was never genuine to begin with, I strung her along, and that she deserves more from me than I have given her. But I can't engage with this any more and I am hoping, really hoping, that she will take that as an indication that we have made our decisions as evidenced by the conversations we have had, and move on from there. I feel that I have been as concrete as I can be without beating a dead horse and risking re-engaging all over again.

Friendships aren't a contract, and although I feel that in some ways that I have failed her, I am eager to shed the title of therapist, emergency contact, stand-in partner, and confessional and move on with my life. I wish she knew how much I loved her, as I know the only way she will heal from this is having left feeling wronged.

Now comes the damage control. Where do I go from here?