hi Kweasel and

im glad you found us! we definitely understand how hard it can be to keep your cool during outbursts, episodes, dysregulations... .it can be highly anxiety inducing, especially when your buttons are being pushed.
im no longer with my former partner, but it was a struggle for me too. i went on to learn the skills and tools we teach here, and i can see now that i could have given myself a lot more space, not unintentionally escalated the situation, and in general made things a lot easier on myself. my dad had some BPD traits as well, mostly the dysregulation, anger, and button pushing. in my experience you cant just discipline yourself into not losing your cool, it takes a lot of mindfulness, practice, and seeing the results, and over time, youll find your automatic reactions change.
probably the easiest, simplest first tool to implement is to learn not to JADE. it tends to keep circular arguments going, and the less of those you have, the more space and peace you will have, and then it gets easier to implement the other communication tools.
how long have the two of you been together? is your partner diagnosed?