If your spouse uses an Android phone and is logged on to Google on a shared computer, you can type “Find My Phone” into the search bar, and you'll be provided with the phone's location.

As we become more reliant on GPS these days, you may also want to take a peek at your spouse's location history. For Google users, the “previous destinations” menu option on the navigation system may chronicle your spouse's movements; for Android users, the Google Timeline feature (found in the Google Maps app or Google Maps online if they are logged in) functions similarly.

It's easy to make these files and even easier to distribute them unnoticed

You can find their frequent locations in Settings > Privacy > Location Services > System Services > Significant Locations.