Friend won't give me space or alone time...and I told her.?

[Eddy H]

I have a friend who I recently stopped talking to because of the way she treated me. She recently told me she missed me and at the time I couldn't resist saying the same thing back to her. I did miss her. Now, she constantly calls me and texts me everyday trying to rebuild our friendship. I used to be her "best friend" because I always treated her like more than a friend. I did things for her I wouldn't do for anyone else and I always took care of her and was there for her. I never felt appreciated because she would always be angry at me for unknown reasons and treat me like shit. I'm sick of it now and I'm sick of taking responsibility for anyone's happiness. She keeps asking me to go over to her house but the truth is, after what happened the last time, I don't ever want to go back. I know she won't change and I'm not asking her to. It's just so painful to ignore her all the time. But when I think of her I can't focus on anything. Confused and it sucks. Any advice?