Frustrated,
I'm sorry you've ended up here, but welcome. We understand how hard it is to be in a relationship with a partner who has BPD.
He doesn't seem to understand your needs for support and understanding and you've been taking care of his for years. Now you're wondering if it's possible that you could have a fulfilling relationship with him. And you're feeling anxious and you have no family to give you support.
It's good that you're cautious about going further with this relationship. It is possible for improvement, but it takes quite a bit of work on your part. Learning the tools that are available here can make a big difference, but you still will have a partner with BPD.
Can you tell us some of the issues you're dealing with?
Cat