Hi Lifesailor1, glad you felt ready to reach out and get some support here
Yes, I recall some members' stories here, where a significant stressor, or series of stressful events, "triggered" more visible BPD behaviors after many years of it being "dormant". I think one member was married for ~15 years before a natural disaster they went through was what "set off" his wife. So, if that's similar to what's going on for you, you're not alone.
How long have the two of you been together? What was the event that triggered things in your relationship?