My Columbo Moment

Oh, there's just one more thing about Iran's 2003 suspension of their nuclear weapons program that I don't understand.

So, by fall 2003, after we failed to dig up significant stockpiles of chemical weapons in Iraq, showing that we'd invade a country if we simply thought they had weapons of mass destruction, Iran suspends their nuclear weapons program yet doesn't bother to tell us about it? They don't even tell the French, Russians, or Chinese in the hope they will tell us and keep us from attacking Iran?

Nothing like that? Iran instead secretly stops their weapons program and hopes that President Bush won't attack Iran?

This makes sense ... how?