Hello Grantland,
This site can absolutely help you understand and manage the craziness that you sometimes face when you are in a relationship with a borderline.
I can sympathize with that feeling like you are going crazy ... .asking yourself
what the heck just happened or
where the heck is this coming from.
Understanding BPD and what it takes to be in a relationship with someone who suffers from it is going to be critical for you.
Has you partner been formally diagnosed? If she has what is she doing about it?
With respect to your own education, what resources have you explored so far? I highly recommend everyone start with the general articles on relationships with borderlines.
https://bpdfamily.com/portfolio-4-colsThis will help you to get a general understanding of BPD and the types of relationships and challenges those relationships might present to you.
Please feel free to share more of your story. It really does help to write it all down and get others input when you are trying to make sense of something that doesn't seem to make any sense at all. You will find the more you participate here the clearer your own thoughts will get.
I look forward to hearing more of your story.