Behold, a joke

The trailer concludes with its one light-hearted joke, as Peter and Nebula loudly brush off the idea that they could potentially be attracted to each other… or do they?
Is Quill still upset about Gamora or is he just traumatized? Is this genuine emotion or is he really just trying to avoid resolution of his emotional conflicts in order to continue to live without considering the consequences of his assumptions on the people around him? Maybe he really does love Nebula?