Hi spacie ,
Welcome to the board. How does your husband respond when you stop talking to him during an argument? In not saying anything, does this allow you to be authentic to yourself and state how you feel?
One important thing when communicating with someone with BPD is to validate what they are feeling. They often begin to yell because they think they are not being heard or not understood. Shutting down communication by not speaking during an argument can trigger fears of abandonment in them. There are many workshops on the right side of the board that can help you learn new ways of communicating with your pwBPD. Could your not speaking during arguments be causing him to use the silent treatment?
Here is a link to one of them on something we call S.E.T (Support Empahty Truth)
https://bpdfamily.com/message_board/index.php?topic=143695.0