From this clouded haze each party, like a blind bird flying in the wind seeks control in an effort to protect themselves and to try to regain some balance. You are going to be blamed because often the borderline has lost total sight of you. You have become someone from their past that they could not trust. To want to get better means be ready to face the pain. It is only when you face the pain that you will begin to gain a healthy perspective from which you can then think less distortly to the point where you will be able to recognize when you are so triggered as to blur your past with someone in your present.
Personal responsibility is key here as well.
You must take responsibility for your needs, your wants, your pain, your actions and you must learn that there is no excuse for abuse. Blaming anyone else, even someone who abused or hurt you in childhood is not going to help you heal now. It will not help you meet your needs. It will not help you learn how to maintain relationships. It will not help you to find yourself.