Welcome, Reidelsk8!
BPD can be bewildering, I know. He may or may not have it, but, regardless, if he's showing symptoms, we can help you with skills and experience to navigate.
For dealing with the alcohol, you'll find that substance abuse is very common in pwBPD. I know other members have found much help and support by attending Al Anon meetings. Have you considered that or looked into it?
On the dishonesty, I'm not sure from your post exactly what he's been dishonest about (other than drinking) but one hallmark of BPD is that for pwBPD, feelings usually equal facts. When he's dysregulating, I've seen my H make enormous leaps of logic, twist facts, or completely misrepresent a situation. It's not that he's necessarily intending to lie. It's that his feelings are so strong, so painful, that his brain twists reality to make it more acceptable and ease the pain. Sounds and seems completely ridiculous and irrational to us Nons, but it is their reality. Just something to keep in mind.
In the case of the drinking, pwBPD often have a very strong/overactive sense of shame. Just spitballing here and I could be wrong -- he may well know that his drinking is a problem and he can't face the guilt. So, he lies. Some pwBPD will project (for instance, say YOU have the drinking problem).
This is not to excuse him. Just to explain what might be going on.
Will his therapist figure it out? I don't know. BPD is notoriously difficult to diagnose and this board is full of stories of people whose loved ones were able to "smoke" their trained therapist. Unless the therapist is trained in personality disorders, it's very possible the diagnosis would slip right by.
Whether he's ever diagnosed or not, there are things you can do. There are a lot of skills and experience we have that we can share with you if you're interested. When you feel like it, perhaps you can share a recent example of an incident -- sort of a he said/she said play-by-play. Details really help us get a handle on the situation and help us see what tools might be most helpful to you.
Again, welcome!
