The music video tells a lot about high school. Theres the big football star, the blond nerd (no offense but that's one of her alter egos in this music video), and the cheer captian (the other alter ego). The football guy and the captian are dating, but the nerd thinks otherwise. He should be with her because she understands him more than the captain.
By the way, taylor swift if you read this, you look awsome with blond and brunette hair!