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an explainer for “Don’t You” by Taylor Swift from #FearlessTaylorsVersion 
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"Don& #39;t You" is about a person (the singer) who runs into a former love out of the blue -- someone who she still has feelings for. but her partner has moved on and has a new girlfriend/wife, but the singer still loves the partner (will use he/him pronouns for clarity)
the key to the song is in the title: "don& #39;t you." don& #39;t you is a shortened version of the phrase "don& #39;t you dare," which is said to another person to tell them not to do something, otherwise it will make the speaker angry or upset. ex) don& #39;t you dare slam that door!
so in the first half of the chorus, Taylor& #39;s character is singing to him: don& #39;t you (dare) be friendly and act nicely to me because "you don& #39;t know how much I feel I love you still." she still has feelings for him and him talking to her and being happy makes it worse.
but that& #39;s not the only use of "don& #39;t you" in the song because Taylor does the thing she does so well, which is to take a common phrase and twist it.
in the last two lines of the chorus, she turns "don& #39;t you (dare)" into "why don& #39;t you?" as in "why don& #39;t you love me anymore?" so she goes from an angry demand to a tragic plea for him to love her again.
