It was foreshadowed since 411, if we are exclusively referring to this season, when they were holding hands at Pop’s. From that moment, people began to speculate about whether or not it was real. Because it was obviously meant to look romantic. Turns out, while it happened during the time they pretending to date, the feelings were real.
But that has nothing to do with whether or not Betty is devoted to Jughead. She loves Jughead. But feelings that she always felt for Archie resurfaced. All these things can be true simultaneously.
It’s not about giving the writers credit —it’s more