How do I unsync from someone I share information with

How are they synced exactly?

What exactly was done to get them synced?

What information are you sharing exactly?

There is no apple supported way of actually doing that.

If you are sharing an Apple ID, then stop. Apple IDs should not be shared, and each person should be using their own.

Explain exactly what its happening, and someone here may be able to advise.

If there’s somewhere else syncing with my information, I did not approve of it. I feel like it’s happened over Wi-Fi I just been hacked I don’t know