Jess and Nick dance around their obvious feelings for far too long, and after Jess left New Girl temporarily in season 5 the two finally reconcile at the very end of season 6. New Girl's final season leaps three years into the future, and Nick marries Jess.
Nick reveals he is going to propose in About Three Years Later and does so in Mario. They marry in The Curse of the Pirate Bride. In Engram Pattersky they are revealed to have a child together in the future.