Dad can see messages iphone?

So I recently found out that my dad was getting all my iMessages (I was signed in on his Apple ID and iCloud)
So I left his account and made my own free Apple ID and made my own iCloud did I do everything to make sure that he can't see my messages? Please tell me if there's some way he can still see them

If you are registered with your own ID then your father won't get messages. Don't worry

Not anymore. Getting your own Apple ID stopped that.

Your dad can't see your messages any more with your own account.