Archie tells Betty that Jughead's birthday is coming up and that they go see a movie every year, but he thinks Betty should take him this year. Betty calls FP to invite him, but he says no and informs her that Jughead hates surprises and birthday parties. She decides to throw him a small surprise party anyway.
Betty and Jughead go to the movies as planned, but when they show up to Archie's house, Jughead is surprised. He tells Betty that he wishes the four regular friends were hanging out at Pop's. And when Betty asks why he can't be normal, Jughead responds that he will never be normal.
When Cheryl and a bunch of people show up, Jughead escapes to the garage and his dad finds him. Jughead confronts Betty over inviting his dad to a party with alcohol knowing his dad has a problem. Angry, he asks her if she ever considered their differences and says she's only with him because Archie doesn't want her. Betty is surprised and starts to cry. Before Jughead can leave though, he's sucked into a game of Secrets and Sins. He gets in a fight to defend Betty during the game.
Jughead and Betty then reconcile over milkshakes at Pop's.
Source : http://www.thisisinsider.com/riverdale-betty-and-jughead-bughead-relationship-timeline-2017-11