How to unpair Bangle.js 2 from Gadgetbridge ?

I removed it and started messing around with just the Music Controls widget.

I think what's happened here is maybe that HID has been enabled in bluetooth settings (some remote control apps turn is on for you). When HID is enabled, Bangle.js looks like a mouse/keyboard/etc to any device connecting to it.

That means that like a bluetooth mouse, the computer will actively attempt to connect to it whenever it can. You just need to ensure you remove/unpair the Bangle from the Operating System's bluetooth menu on every device you used it with.

It's not enough to just disconnect from the Web IDE/App Loader/Gadgetbridge since it's the actual OS that's trying to do the connection