Losing trust for how you sat on a couch? That’s her crazy, not yours. AS is the blaming you for it. Crazy squared. And why sufferers reeeeeeally need to own their own triggers. You did nothing wrong by sitting down. Full stop.
Something my exHusband (who did NOT have PTSD, both he and his sister had/have different personality disorders from their childhood trauma) could never wrap his head around… why I’d react one way when he was going out sometimes, and different ways other times.

Mon - Have a great time!

Tues - Cool! Have fun!

Wed - It’s a busy week this week, isn’t it? Alright. See you later.

Thurs - No problem, but make sure to set some time aside soon, we have those things we talked about that we need to do together, and I need at least one night this week for solo stuff. We can put off the us-stuff if you want, but I need at least one night where you’re here so I can go. (Kids) Or I need the money for a sitter. Either, or, really.

Fri - I know it’s the weekend, but we talked about this. Pick a day, I need you here at least one night this week, or babysitting money.

Sat - Have a great time! (Yay! Now I know I can make plans for tomorrow)

Sun - WTFO?!? No. I am NOT okay if you go out AND “dont have the money” for the sitter. How much money have you spent this week going out, and you can’t even EITHER stay in for one damn day OR pay a sitter?!? How many rounds of drinks and tabs have you picked up this week with your friends? I can tell you, over $1500 worth. But $50 for your wife is just breaking the bank, is it?

Mon - f*ck no, I am not okay with you going out, again, and leaving me in the lurch, again.

Tues - OF COURSE I’M MAD.
He, honestly, could. not. understand. why “the exact same thing” (going out) is different over time (like the above), or in different situations (like a day with no plans -vs- a day with school, which is somewhat flexible -vs- a day with work, and is not flexible at all) …all, in his head, “should” have the same response if he doesn’t show up and I have to stay home with the kids, or frantically attempt to arrange childcare, and arrive late… and heaven help us if there was an honest to good emergency (I’m talking car wreck, house fire, kid in the hospital level emergency, not even the low level / subjective “I’m sick” so plans need to change normal part of life, or a missed opportunity “emergency”). Because (spoiler alert!) he wouldn’t change his plans, if an emergency happened, but he would make everyone (us) around him MISERABLE for weeks, if his friends caught wind of what was up (he would tell them) and “we” embarrassed him, because his friends said he should leave, and be with us, instead of out with them. (Because he usually had fairly normal friends, until they got to know him, and left him.) Aaaaargh. Making easy things hard, and hard things harder??? My ex’s specialty. Brick wall. Bang head.
EVENTUALLY? My ex DID get the “consistent” response he wanted/demanded.

<<< me >>> To everything.
- Not thrilled, excited, happy, encouraging, nor willing to sacrifice to make something happen.
- Not concerned, irritated, vexed, pissed off, furious, nor willing to fight to make anything better.
Nada. Ambivalent. Uninterested. DGAF… and? Completely wrote him out of my life. First we were just 2 people who lived together, and then I divorced him.
^^^
So … I don’t know if that’s the kind of inconsistent or consistent you’re talking about?
(normal healthy person with different reactions to different things, & changing circumstance … or WTF I don’t care).
((And I reeeeally don’t wanna project. There’s umpteen different kinds of consistent / inconsistent))
But it’s beginning to sound like it.