This isn't one of the critical applications. It's not like it needs to retain hub bearing preload.
If the locking feature is good enough that you can't run the nut on with your hand, it's still good enough to reuse.
There are some applications where the service manual does say to always go together with a new nut.
After 7 - 8 eight times, I'd be replacing it, too, even if I couldn't turn it by hand.
2008 Unlimited Rubicon Automatic