1.) If it says your "ID/Password is incorrect" then it means:
a.) You have attempted to login so many times with an invalid password, but did not complete the "captcha" test after z8games redirects you to the login page
b.) Your password has been changed.
2.) You can read messages and then mark them as "unchecked" or "unread", this will make it seem like they have not been opened before.
3.) If the "bot" came with an auto update feature, then its possible that he could have installed a backdoor on your system. Friends mean nothing in this game, their all in it for some sort of profit. ( a few exceptions.)