HI A or B?,
I have the same questions about my H. He scores extremely high on Aspberger tests, but he also presents with almost every diagnosis criteria for BPD. BPD and Aspberger's present similarly at times and just because someone has one doesn't mean they can't have the other. Only a qualified professional can parse out the difference.
Either way, all of the lessons on the right side of the page will help you communicate better whether he has autism or BPD. I agree with
foggydew. For us nons, putting a name on things can help us feel more in control of what is going on in our relationship, but in the end, we have to start working on ourselves and improving how we respond in the relationship.
To get you started, here is a link to one of our workshops on
Supporting your pwBPD.