Steve rolled his eyes. "Not Jack's boyfriend. But yeah. And, yes. I have it. She let me in with the condition that I won't use it." He had to get back to Earth somehow, after all. And while he was aware that he could use the gem for that purpose (the gem had told him how the instant the thought had suggested the possibility of crossing his mind), he didn't think it was a good idea to use the gem's power for even a minor thing. Correcting the damage the Collector had done was one thing - using the gem for his own gain was something else entirely.
"You told me to hide it. I can do that. No one will know where it is."