Hi ILoveMyBPDMan,
it is a bit a confusing situation you are in. You got a relationship but it seems not be the one you seek. Whether at one time something can turn your relationship into a romantic one is probably not alone a factor of BPD. Sex tends to be a complicated topic.
he obsesses over his ex - the one that got away - the most perfect woman in the world and he messed it up by cheating (5 times but who's counting - I believe the ex may be borderline as well)
Sounds like he is still attached to her. The intense relationships tend to cause strong bonds - not always positive bonds but strong nonetheless. Detaching takes time - you wrote it was maybe a 5 year process in your marriage.
The only thing I would change about him would be to take away all his pain.
And sink infinite resources into the bottomless pit. You can't help him. He got to do that. You can only point out that he is in pain and ensure seeing this is not hurting you too much. See workshops on validation and boundaries.
I do have friends and outside interests.
Protect them.
I guess I need someone to help me understand what is going on.
He is confused. Trying to see logic in what he does is not getting you anywhere it is just confusing you more. Take a step back and focus communication on emotional basics as
He has a very difficult time expressing what he is feeling.
that is keeping him from thinking clearly.
He has no qualms about telling me he needs me or that he loves and respects me; that I am the most important person in his life; that he doesn't know what he would do without me; that I have know idea how much he cares for me; that he would do ANYTHING for me;that his life would be crap without me and that I am the reason he isn't dead or no longer sober. In recent months, he has wanted to always be honest with me which previously, he tried to lie (when there was no good reason) because that is what he has always done.
This is what he is saying. But then
He travels frequently for his job and has recently moved 2 hours away.
this is what he has been doing.
I am not giving up on him and we have both educated ourselves about BPD.
It would be important that he commits to therapy. DBT is targeted education and training.
Focus on emotions and behavior when you try to understand him and discount words. Work on validation skills and protect what you got. The stability of the relationship depends a lot on boundaries and maybe it is easier to go slowly and get those in place before the relationship steers into a big crisis.

,
a0