I'm not sure exactly what the general consensus is on Haruka Michiru and Setsuna's relationship but I choose to believe that because they all wear matching rings that they kiss like halfway through the Eternal or the Dream Arc, that the three of them are "married" (Quotes because they can't legally marry yet for a multitude of reasons) But as the firm believer in Asexual Setsuna, I am I say that she is only in a romantic but not physical relationship with them, whereas Haruka and Michiru are in a romantic and physical relationship <3