Google synched all my contacts to my wife's phone without permission. WTF?

First time posting in this sub, greetings to all.

Several months back I installed a Google cam at the house. After setting it up on my phone, the only way I saw to allow my wife to view the cam was to link her phone to my Google account.

Well, she just came up to me asking why all my friends were on her phone. It seems like Google copied all the contacts from my phone and transferred them onto …

back cam contacts google house link permission phone privacy wife