There were a whole lot of ways that Tony could assume Steve would mean 'betrayed his trust', and actually lying didn't even make the list. He was more surprised than wary when he echoed, "You lied?" And, just to make sure, "To me?" The distinction between him and the other Tony didn't seem so important then. That couldn't have been right, Steve's righteous view of the world must have been gumming up his works. "Are you sure you're not just getting up your own ass about it? You know, so truth and justice are still the only correct answer? I promise you, the rest of us don't take them as seriously, we've got some wiggle room."