Betty discovers that it's Jughead's birthday, so as the perfect girlfriend (yes, by this point they are boyfriend and girlfriend) she decides to throw him a small surprise party, although she's been warned that he hates surprises. The party doesn't exactly go as planned with half of the school showing up, and Jughead freaking out, but we love how much Betty cares about Jug. In the end of the episode they kiss and make up, so it's a win in our book.