She broke his heart.
You didn't know what to expect when you found Jughead in the emptied living room of what once was the Andrew's residence. The house was nearly stripped, the familiar patterned sofas where you and Jughead would toke it up on marijuana while Betty studied on the floor were gone. The smell of strawberry pancakes weren't faint, anymore. The records playing from upstairs were null, quiet.
His eyes were sore, bloodshot, like he spent the entirety of the morning crying. You had just came home from a sudden business plight with your father, who was an oil tycoon on the East Coast, that you had to take care of. Corporations didn't take care for time, and it took you a long time to realize that.
You missed graduation. You missed your best friends leave Riverdale and move on with their lives. You missed the fact that Betty and Jughead broke up. You missed that Betty and Archie had an affair — ruined their friend group. You missed that Betty and Archie made Veronica flee to New York to be the female Wolf of Wallstreet.
"Juggie?" you prompted softly. You were, unfortunately, so clueless. You had no right to be. Nobody called you. Nobody told you what happened. "Why is the house empty? Where's... everybody? Where's Betty?"
Jughead's pale blue eyes snapped up to you, as though you had broken his numb stupor.
"Oh. You're back," he said, dazed, before he considered what you just said. The house was empty. Betty was gone. No more Betty Cooper. "It's just me, now."