I did not let anyone know my password but my girlfriend.
How can I get her out of my account sittings
Change your Password:
Create a strong password for your Apple ID, It is best if your password consists of eight or more characters and include upper and lowercase letters, and at least one number. You can also add extra characters and punctuation marks to make your password even stronger.
Never provide your password, passcode, security questions, verification codes, recovery key or any other account security details to anyone else. Apple will never ask you for this information.
Then see this Apple article: What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support
Check ⤵️
If you think your Apple ID has been compromised
If you think your Apple ID has been compromised - Apple Support
Manage and use your Apple ID
Manage and use your Apple ID – Apple Support (UK)
See who has access to your device or accounts
See who has access to your device or accounts – Apple Support (UK)
Security and your Apple ID
Security and your Apple ID - Apple Support
Get a verification code and sign in with two-factor authentication
Get a verification code and sign in with two-factor authentication - Apple Support
Check your Apple ID device list to see where you're signed in
Check your Apple ID device list to see where you're signed in - Apple Support
- if you see devices that don't belong to you, delete from your account.
Never jailbroken your iPhone.
safari stops working and I am using Wi-Fi and I check everything . This happens a lot and I go days and I can’t use my data
Try to optimize the range of the mobile network, see this Apple article:
If you see No Service or Searching on your iPhone or iPad
If you see No Service or Searching on your iPhone or iPad - Apple Support
Check your Wi-Fi:
Connect to Wi-Fi on your iPhone, iPad, or iPod touch
Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support
If they are On, turn Off Hotspot & VPN.
Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch
Clear the history and cookies from Safari on your iPhone, iPad, or iPod touch - Apple Support
If Safari isn't loading websites or quits on your iPhone, iPad, or iPod touch
If Safari isn't loading websites or quits on your iPhone, iPad, or iPod touch - Apple Support