Hi akinyi,
It sounds like a very stressful time for you both. It can feel very painful to be in the receiving end of false accusations and rage. Many people here will be able to relate to that.
You say "physical aggressiveness" - can you tell us more about that?
How do you feel about the diagnosis? Do you know how he feels about it?
It's brilliant that he's going to start DBT - it is a very effective treatment for BPD. Also there are tools and techniques here which you can learn that can really help to improve relationship dynamics and interactions between couples. There is certainly hope.