How Can I Delete My Xbox Live Profile off Someone Elses Xbox 360?

okay so here is the deal. I had once linked my profile to my old roomates xbox and now we don't live together (or get along). I really don't want him to scew with my account. I mean my bank account and everything is linked to my xbox live account. not to mention I like it and don't want to have to get a new one. can anyone help?

Suggestion:

Recover your account on another Xbox 360. That will invalidate the copy on your ex-roommate's console, and the next time he tries to connect to Live with your gamertag it will ask him to recover it which he won't be able to do if he doesn't know the email address and password.

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