You've come to the right place. Many members have come here after decades in a BPD relationship. This is a good place to get support and learn coping tools. This problem grew over years, and is not something you'll solve quickly, but you can make improvements.
In general, we strongly advise against trying to convince a person they have BPD. It is usually fruitless, and just increases conflict.
Can you give us more detail about his inappropriate behaviors? What happened over the holidays?
RC