It is hard to start calling somebody a different name. And it would be weird, too. Definitely overthinking the situation.

Be grateful he is so kind and positive with his ex - it speaks highly of his character. I'd worry a lot more if he called her 'crazy'.

It would annoy me too.

My ex-husband used to call me Babe for years after we split up, even after he got remarried. I seriously think it was just a reflex. I thought it was hilarious!

Well you are the second wife. He can't erase years of familiarity with his first wife. Thats just something you'll have to get comfortable with.

OP, people are being harsh because that's dcum, but I think your feelings are relatable. You already gave all the appropriate caveats about knowing it's silly and that you're not gonna say anything -- which I agree with -- but I totally get what you're saying. It's familial -- and yes they WERE family, but they are not now, so it feels too intimate.

My ex wife is Kuntress

Get it over it. If you're this insecure about something as silly as this he's got a long road ahead of him with you.