First thing’s first: Dragon Age: Inquisition never happened. The entire plot that should have happened? All in their DLC Trespasser, and I will do a post about that another time. So anyway:
In DLC Trespasser, the Inquisitor gets to marry Cullen Rutherford (or Sera) if he’s been a successful romance option in the “main game.” Not only is it boring and over in literally 30 seconds, but the secrecy was pointless and the whole set-up the worst wedding ever.