The Inspector and Constable Reggie will never be canonically romantically involved. The Inspector will live far longer then Reggie and though on the surface S02E13 looks like it’s about the strength of their bond not wavering despite eons and seperate planetary location, how they were yet able to communicate, theres an underlying theme of mortality. Reggie’s mortality, and his impending death. That moment where the inspector is in the chambre, realizing Reggie is dead here in the future, but that bittersweet realization that Reggie is just a nucleionic fluid replacement in the darsit away, is just so impactful. He’s not happy, and his dialogue to Barbara Clarke reflects it. He’s talking a lot slower, and that moment when he grabs onto Reggies arm, pulling him back in the darsit. When Reggie says he loves the inspector and the inspector says “mate, I missed you.” Not responding with the truthful “i love you too” or acknowledging the romantic undertones of that statement because the inspector knows he simply cannot love Reggie.