Hey Boogie74, glad you reached out. Understood that there's a lot to unpack -- go at whatever pace works for you, no worries.
Six years is a long time. I'm guessing you guys were together before getting engaged?
She tends to have splitting and rage episodes before she goes to bed as well as after what seems to be positive and enjoyable experiences.
That stood out to me as, sadly, pretty typical and common for pwBPD (people with BPD, whether diagnosed or not). It's part of why BPD is a mental illness -- pwBPD experience life and reality really, really differently from non-PD people.
How long would you say she's been like this? Since you guys met? Before? After? Was there ever "an event" that seemed to "flip a switch" (maybe getting engaged, or a graduation, or a death in the family)? Or has she pretty much always been "like this"?
Boogie74, as you mentioned that she has punched and pushed you, I want to make you aware of this resource:
https://www.thehotline.org/for DV. There are old stereotypes that "men can't have DV happen to them" but that isn't true. Sometimes we also tell ourselves that "it wasn't really DV because". While there's no pressure on you here to label any event or any interaction as anything, I just want to put that link out there for you, so you know that you have a LOT of people you can talk to about your relationship -- us, via the boards, and the hotline, for in-person conversations.
Are you back at the house?
-kells76