Snowden says he left the US without telling her why or what he planned to do, which pretty much means he'll likely never see her again. Putting aside the whole issue of the NSA leaks as to whether they're good or bad, dumping your girlfriend and then telling her on an international broadcast is an incredibly shitty and childish and irresponsible thing to do.
One has to imagine this might have been a relationship with existing problems before his big surprise. He didn't trust his girlfriend enough to tell her what he wanted to do, to ask her advice and counsel and consent. Instead, he trivialized and discarded her. He forced his decision on her before she had a chance to prepare herself and then sent her the ultimate "Dead Jane" letter. He may have left Hawaii thinking he had a girlfriend, but a woman in your bed who you treat like this is no longer your girlfriend once you get on that plane.
If there's any consolation for her, she could dine out on his name by selling her rights and/or writing a book herself. Understandably, she might not want to do that. But if it was me and a male had treated me like this, I would definitely consider this an option. Because if a guy is going to make my life hell, might as well make that hell a bit profitable with some nice creature comforts.


