hi thejimmy, and

a complicated relationship, for your first. im glad you found us.
ill be frank: underneath it all, its not really clear why you want her back. you mention a high. and certainly, no one would like to reconnect and then be rejected.
but the key to getting back together isnt just getting back together (youll break up over the same stuff and with more pain than before), and i can tell youve given that some thought. the key is really understanding what broke the relationship down, and what is going to change, and how.
people with bpd have inherent trust issues. clear as day, shes telling you the breakup really hurt her. she, likely, after four months, has grieved the relationship to a large extent, and entertaining the idea of giving it another go is probably pretty scary.
you may not be able to fix that, even if you do get back together.
so i think the first thing to do is consider whether this is a first love that youre having a difficult time grieving, and whether the "cure" is getting back together,, or fully grieving and letting go. youre on the Bettering/Reversing board, so if you want to reconcile, we will support your effort in doing so.
but the question becomes how.
it doesnt sound like her feelings are dead and gone. that would be promising, but for the fact that her feelings mostly sound like dread and pain. that can change, but you need an opening, one much softer and lighter, and no pressure. is there anything connecting the two of you? are you friends on social media? any mutual friends?
tell us more about what happened in that last conversation, what you said, what she said.