Season 1, Ep. 3: When They Revived the School Paper
One of Betty and Jughead's, or "Juggie" as Betty sweetly calls him, first moments together (or one that showed the potential of their romance at least) was when Betty enlisted Jug's help to revive the Blue and Gold, aka the student newspaper at Riverdale High. Working together on the paper unites them in a mission to solve Jason Blossom's murder and it's only the beginning of them cracking cases side by side.