
I'm sorry for the pain you're feeling. A simple way to look at this is that your relationship together has undergone a huge change. It's a lot to adjust to. Be patient with the situation and yourself. It's normal for it to feel completely disorienting, and it's normal to be discouraged.
You're rebuilding the relationship with a whole new set of circumstances. You mentioned that perhaps it's more like a "normal" relationship. I don't know about you, but when I was deep in a relationship with a pwBPD, I wasn't really sure what normal was ;) In any relationship, it's important to find ways to make it stronger, and to find strength from it. You might be interested in reading the book,
The Seven Principles for Making Marriage Work, by John Gottman. Don't worry about the title -- he studied successfully married couples, but his findings are relevant to any long term relationship. It might give you some ideas about where to put your energy to strengthen your relationship, and how things might look in a world without big cycles.
Can you tell us if there are moments when you feel a good connection with him?
RC