I don't know how can he stealing my money if have not access to my vps.
How check private keys in console vps? I think he forgot set private key before my changed passwords.
Someone who has your private key can steal your funds at any time and without warning. He does not need further access to your server to do so.
I hate to say this, but this response makes you look dangerously uninformed and casts some doubt on your qualification for operating a Bitcoin casino, regardless of whether the other allegations are true. As a casino operator you are responsible for keeping your players' funds safe. Using a server that an untrustworthy third party set up and a private key that you did not generate yourself is grossly negligent.