Repeat offender

Do you have a friend that you have the same issue come up over and over? Well I have a friend like that in my life. Hoping that things will change and she'll learn. So for the 5th time in 2 years I have once again told her the issues that are bothering me between our friendship... Now mind you I didn't even get into all the things bothering me just mentioned a few. She made it seem like it's all new and that she'll just have to prove herself. Well I have learned that I am not going to expect anything and have lowered my expectations. I also have been working on not thinking this person as a close friend and that is helping me out also. My friend S has been helping me with this - not to say that I haven't vented. But we've all known each other for so long and have history together that I am not going to just throw the friendship away. Just learning that people grow apart and that's okay. The thing that's hard is that she took it as we 'love' her that much to feel this way.. No you are messing up lady and need to prove that you are a good friend. I just feel that she takes things in differently and not for what we are saying.. So how long can a person take this?