With V. Bulletin, you can't really delete your account (screws up the threads and quotes). You can choose to not use it or ask a moderator to change your password to something you don't know so you can't access your account. You can also do something to get yourself banned (your account sill exists, but you are not able to post). I think you should give your girlfriend your account information and let her change the password so you don't know what it is. Then you can create a new one she doesn't know about. Hope all is well...