Apologies if my title sounded like I was posing a "should I stay or leave" question, I just saw the guideline and it isn't intended that way. I would like to hear people's similar experiences and their opinions of mine and who I'm being while trying to save my relationship so that I can determine what to do on my own.
the question, and the choice, are yours to make. we can help you explore your options, and take the healthiest path in whichever direction you decide to go. we wont make it for you.

, Stuckinacycle
I know that whirlwind beginnings in romance with people with BPD is a thing, but man it still felt real to me and I still love her enough to hope things can get better again
whirlwind romances in general are a thing. it is what drew a lot of us into the relationship with our partners, and vice versa. its a very rejuvenating thing. but at a certain point, new challenges, adversity, and conflict rise into our relationship. both parties tend to struggle with this change, and the question is whether both parties, as a team, can overcome them.
i think its important to maintain realistic expectations going forward. relationships do not remain in a state of honeymoon. there will be glimpses, but that time where everyones guard is down, where everything comes easily, where everything brings you closer, that time has past.
none of that is to say you cant have a happy or passionate relationship. you can.
tell us more about the primary sources of conflict in your relationship with her.