Hi and welcome

Being in a relationship with a person with BPD is a kind of special needs relationship. It takes extra skills and stamina --
check here. It also happens to attract us people pleasers (caretakers). Poor boundaries ultimately lead to a blow up on either side, so it's actually best for the long term to have boundaries to protect yourself and set reasonable expectations on the other's behavior.
It's good to hear you're going to therapy. Do take care of yourself and work with your therapist and yourself to make boundaries to protect yourself. Can you share some that you're thinking about? Best to start with a small one to test the waters and work your way up to bigger ones.
To avoid fights, I like to
avoid JADE and remember
this story.