Girl Code #1: never date your friends ex or someone they are really into

The most most important code of the girl code is never date your best friends ex.

Betty Cooper has zero intention of breaking that, even if she's been in love with Jughead Jones since she was 9. He dated Veronica her best friend and that made him off limits. Even if they did break up, even if he's always there to tempt her. She can't betray Veronica like that