How do I stop my iPhone from trying to pair with my Apple Watch?

Tap Settings > Bluetooth and see if there is anything that looks like an Apple Watch. If so, tap it and then the "Remove this device" on the next screen. If not, try restarting the iPhone:

Restart your iPhone - Apple Support

I have an Apple watch that has been connected for quite some time. HOwever since today's iOS update the phone is constantly asking me to pair my watch. In the watch app it's still fine and paired.

Mine has been doing the same thing since the 17.5.1 update. At least ten times a day. You are not alone. :-(

I’m having the same problem it’s frustrating I have unpaired my watch and set it up again but still getting this pop up, I checked Bluetooth nothing going on there and tried going through the set up process for it to only fail. This happened after my last update

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And here in London. It's been doing it for weeks. A chat with Apple support suggested I reset my device. Which made nodifference, apart from losing all my app settings. Seems to have got even worse in the last few days. Please, Apple, fix this . . .

No watch listed... never had one... still getting the message - over and over...

Of course that’s apples. Typical go to move. Reboot reset , redo just make us nuts .

Anyway thank you Jeff Donald your suggestion worked for me if only as a temporary work around until the issue is resolved