Remove Unrecognized Device on Google Play Devices

I got a new phone today, and thus, checked my Google Play devices for the first time. I was looking through the list, and saw a phone on my device list that I have NEVER used. So I searched up what phone it is, and realized it looks like my ex's phone. I know there is no way to delete devices from google play devices, but I need to find out how because I feel extremely invaded right now because I have no idea how her phone (or it could be anyone's) is registered with my Google Play Account.

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