I have been removed from the ambassador program and have no idea why

Check http://enforcement.xbox.com to see if you have received a suspension which would remove you from the program. If not, you'll want to email xboxambs @ microsoft.com to speak
to Ambassador staff.

Yeah i already did.. Nahh don't think so. He only entered the Ambassador site via my email not on the console.

You are more than welcome buddy. Again, I am sorry to hear about the removal.

Hey there shadowby1280

Sorry to hear about your removal. Ultimately this would fall under the fact that you have already pointed out, which is that your account security is your own responsibility at all times. The ambassador team are very thorough and compassionate so I am sure
they didn't come to this decision lightly. You are however, more than welcome to help all of these people on the forums. You don't need to be an ambassador to do that and as you can see, there are many in need of the help.

I hope this helps.

Many thanks,

Cloud

If I were you I would seriously look into changing my password and signing out of my account, both on the computer and the console, when not in use.

Your friend doesn't sound like too much of a friend if he used your account to cheat and not his own. Who knows if he uses your account to cheat at games or not.