I think walking on eggshells is contagious

I do it with my SO's middle daughter and have to regularly check myself.
People with BPD tend to see things a few inches off the ground. It's tempting to get right down to the same level. We (non-BPD) are much better at seeing the 30,000 foot view. It's not uncommon for me to find myself 4 inches off the ground and have to remind myself, oh. Yeah. I can see the big picture.
And you're in legal season, sounds like. Probably everyone is a bit jumpy and nervous. It's a lot of cash walking out the door, we give up a lot of control, and the outcomes are uncertain. Plus, it's about the well-being of kids. All of that together can make anyone feel jacked up and eggshelly.
For what it's worth, I limit how much communication I have by text or email with my SO's D19, and I don't tell her very much about my life. I know she likes me, and I also know she will throw me under the bus in a second to appease her uBPD mom. Even though we're all clear of legal drama, I feel better knowing that I'm not subjecting me or my S15 to that kind of viciousness.
You are taking care of yourself, and have good instincts, even if there is a beat or two while you second guess. It's human
