"
You belong with me
Walkin the streets with
That guy should be happy with who we is with and that girlfriend of his isn't a good person to be with and he should break up with his girlfriend. He should be with me instead of his girlfriend because I'm a good person to be with instead of that girl. She wants a guy to choose her and not be with his cheerleading girlfriend of his. That is what I think Taylor Swift is trying to say in those lyrics