Cut off an ex-partner’s shared album access
Leave or delete the shared album/library, remove the other person, vault anything you still need privately, and check that Shared with You is not resurfacing media.
Revoke
Photos → Albums → shared album → people → remove. For Shared Library, leave the library.
Local copies
Saving a shared photo creates a local copy—audit Recents afterward.
FAQ
Do they get notified?
Apple’s behavior can vary; assume they may notice missing access. Plan accordingly.