Most online games dont allow 2 instance of a game to be run at ANYTIME. same thing applies when logging in to most online accounts If youre logged in on to MSN with one computer, and logon to MSN with the second computer - messenger will automatically log off the first one.
If he was trying to gain control of your account. you most likely would have been kicked as 'youre logging in from a different location'
From my observations, Most hackings usually take place when the player isnt online, logged in or left their pc idle and connected to the internet for hours and hours.
“I used to be a serial upgrader like you, then i took a downgrade to the knee” -FreedomEclipse