I think too it is time to put some distance between you and her.

When she does these things - for example rubbing your nose in the 'car' analogy - what is your response? Do you feel that you can speak up?

If not, do you think maybe she clings to you because you aren't confrontational? Is it perhaps the case she is taking advantage of your kind nature? You are worth more than this.

As suggested, the answer may be to simply turn your back and move forward in your own direction.

I have a friend just recently diagnosed with BPD. Ironically, I knew this was so years ago. She has a difficult history with people and work owing to her unstable personality. There are things though I really like about her. But, during all that time I realized I had to remain at arms length. This was before my own BP diagnosis. I just knew that allowing myself to get closer was a risk to my emotional health. There is now a great distance between us that means we might visit once or twice per year. Honestly I am sure this is the only reason our acquaintanceship still exists. I witness her meltdowns from afar and have the benefit of choosing when and how to respond. I sense though she is clinging on to our friendship as possibly the only one she still has.