So your parents had a tactic of denying themselves for you. This certainly wasn't exposing you to the real world. They set up this whole world for you where you didn't get normal feedback for your behavior. I guess I could see where this would cause BPD? BPD is caused by an invalidating environment. Your feedback from your parents was "manufactured" not natural (they went against their own feelings and didn't let you see the consequences of your behavior on them).