It appears there is an address search on my Google ACCOUNT that I didn't do.

It's not on the Google history for MY physical Computer, but it's on the physical computer's history on my fiancee's computer. It appears, thus, that the address search came from HER computer rather than mine and shows up in my Google Chrome Account only ONCE. I delete nothing from my computer other than putting some emails in "trash" or in "archive." I never delete any history from the ACCOUNT or from the PHYSICAL computer.

Question? What are the KEYSTROKES to comparing a physical computer's google Chrome search history versus the Google Chrome Account search history? THANK YOU!

You must have advanced sync encryption enabled in Chrome to view the history only on the PC that you are using.

See this article for more info: https://support.google.com/chrome/answer/95589

From the sounds of it, it sounds like someone was signed in to your Google account in Chrome when the page was viewed.