It's just difficult for him to imagine trying to start any kind of life when he's never had to do that before. He's always had the help of his parents and financial support and like... not living on a random planet with no one he knows.
"Uh. Okay. Bye then, I guess," he replies, not moving as she goes to stand. He thinks he might just sit there for a while and try and make some sense of things. Not to mention work out where he's meant to go.
"I'm Troy," he calls after her as an after thought.