I'm sorry about the issue. Yes, please click on the website below and sign in your gmail account if prompted, then you can check all the recent device(s) that have accessed your gmail account:
Please reply at the box below to continue troubleshooting. Thank you.
It does not have all information, but if you click on your phone there, does it show the location?
And if it shows only one iphone, then it is yours.
Please let me know. Thank you.
Does it show the date for the second device?
Did you sign in your gmail on any other device previously or give out your password *****?
Was there any issue with your gmail recently?
Can you change your email password ***** the website below:
He can only hack if he has your gmail password. At https://security.google.com/settings/security/activity , can you click on that second iphone, then click on the option Remove, then see if it appears again or not.
To make your gmail very secure, you can turn on 2-Step Verification at the website below:
(Also, make sure you have passcode (or fingerprint) set up on your iphone.) Thank you.
Sorry, did you try that website on a computer if you have?
You can download and install the free app called Lookout from App Store and it will scan your iphone for viruses. Thank you.
For the website https://myaccount.google.com/security/ , try on your computer.
For the Lookout app, download / install straight from App Store on the phone. Thank you.
You're welcome. Thank you for your patience.
Do you need anything else for now? Please reply at the box below. Thank you.