Welcome tyson,
You're in the right place as you'll find the majority of the members here can relate to what you describe in her behaviour. Take a look at the articles and lessons to the right of the board as these will also be immensely helpful to you in aiding your understanding of the experience. Was it a T or yourself who picked up on the possible BPD diagnosis (in other words was she formally diagnosed?) and what were the signs of this in your r/s?
It must have been very tough spending the last year with your ex in a sort of limbo situation. Did you also try to recycle the relationship at any point through that time? How do you feel emotionally now that you are no longer living together and the breakup is more official?
Many of us identify with codependent behaviour and adopt a fixer/rescuer approach in these relationships, so you're far from alone. I'd like to share a link with you to one of the articles I found extremely helpful after my split with my ex. It talks about how a BPD r/s evolves and you may find that you can relate to some or all of this. I'd be interested to know if you see any similarities in your r/s to what is described here.
How a BPD relationship evolves Keep reading here and posting. It's a tough journey out of a BPD r/s and we all support one another on it.
Love and light x