He meant you're free to go wherever you want because it's not going to ping him if you leave the confines of Manhattan, Gene, gosh. He's trying to be cool about this. >:/

"If you go missing," Tony says, bluntly, because there's really no other way to answer that question. "I don't have the time to be checking in on you constantly, and like I said, I don't care what you do with your free time. So unless you're planning on running off, it's just some stylish jewelry." He tries another smile. He thinks it probably isn't very convincing.