How can I prevent unauthorized access to my Apple Account by a jealous spouse or their associates?

“How can I prevent unauthorized access to my Apple Account by a jealous spouse or their associates?“

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Keeping Others Off of your Account:

Change your Password(s), and Create a New email address just for your Apple Account. Then, export all of iCloud to an external drive. Emphasized below…

Avoidance of Stalking:

Q1. “anyone know how to prevent a jealous spouse or say a vindictave spouses ex or current other fling from copying your entire apple account and logging into on mumerous devices because they are a compulsive liar and won't admit to the fact they are basically stalking you so its hard to be traced.[…]”

A1. Secure your Info:

A. Verify your Devices:

Verify that all devices are logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

then...

B. Modify your Credentials:

Having received this, someone may have your credentials. So, by all means, consider modifying them...

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

Avoidance of Hacked iCloud Drive Data:

Q2. “[…]i don't back up to icloud yet i have discovered on multiple occassions my settings being changed a photo not liked being removed and all my messages ate suddenly stored in icloud and have never been.”

A2. Export All of iCloud Drive:

Download all of iCloud to an external drive. Then export it to it. Then, confirm you can access it. Once confirmed, trash what is in there. As a result, you’d access your data in Finder, and would have an empty iCloud Drive. Use my user tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip

Change your passwords. Don't tell them your passwords.