Diddo here, Rainbows.
NC is tricky (for X, anyway) when I manage it for longer periods of time and he doesn't know what's happening with us.
Whenever X is friendlier, or letting emotions show, I tend to suspect an OW tiff or a wish for ego feed that may not be coming from there, so needs to be fed somehow, like the cat when no one's home.
ETA that it's really cool that you're questioning it...and good for you on the NC!Ashland 13
The times, they are'a changin'! -Bob Dylan