Hi ehartma5,
I would feel worried too. My pwBPD spoke about SI once and when I said I wanted a divorce I triggered her fear of abandonment, she started and affair and it was intense anger around the house.
She didn't talk about SI, she was the acting out type and your pwBPD is the acting in type. Everyone's pwBPD is different, you know her better than anyone on the boards.
How old are the kids? How are they coping?
Here's an article with do's and don'ts when our pwBPD self harm.
Self injury and self harm