Hi Shifting Sands,
I wanted to join Allranuthin in welcoming you

Splitting is tough, and being on the receiving end of an abusive blamefest and/or silent treatment is not easy.
How do you interact with him when he blames you for everything? It's common for those of us in BPD relationships to lose sight of our boundaries, to think that appeasing will make things better.
Do you two live together? Sorry to pepper you with questions. Every relationship is unique, and we can help you better if we know a little about your goals, your values, what kind of current living conditions you have.
Hang in there. You're not alone
LnL