Just a thought
Betty straight up took down Veronica in a pretty brutal way to her face in front of a massive group of their friends. But when it came to Jughead she couldn’t even bare to face him, not even to explain they need space as she knew that she wouldn’t be able to do it. And Betty does consider Veronica 100% her best friend but she could cut her out when she forced herself too. This just shows how deep her love for Jughead is, she couldn’t bare to see him hurting and that breaks my heart into a million pieces.