He was hiding it earlier, but now that he admits it, perhaps he trusts her a little more. Otherwise, he would guard something like that. One did not want to appear weak when surrounded by strangers.

Gamora crouches down in front of her suitcase and opens it. "There was some strange fruit in this case I found." How she even knows how to unlock it is beyond her, but she pulls a lime out of the case and offers it to. "Here, you can eat this. I tried one already, so it isn't poisoned."