Don't tell anyone about it, even if you trust them. People can blurt out things without knowing it, so keep your password in your head.
Done.
Uh...
I have many passwords, and I keep a list of them in a Writer document on my phone. Sure, it'd be bad if my phone was stolen, but I don't believe a hacker would be able to access that document, right?
It's a good thing to know that you have different passwords.
But-
Don't risk it.
By chance, if your phone IS stolen, the hacker could get on to the document.
And then it's over.
We don't know what the hackers are capable of. Be prepared and prevent it- that's my message.