Rowling never actually said who Draco married. Parkinson was mentioned during the Hogwarts sequences but I forget in what context. Wouldn’t it be bizarre if he had married someone like Luna or Lavender?
Maybe he married Cho Chang.
The ending implies that Draco was "reformed"; he could be a gung-ho do-gooder for the rest of his life.
Everyone at the Gryffindor, Hufflepuff, and Ravenclaw tables stood to defend Harry.
It was a great moment.