We all get that the song is about a cheating woman, but the intriguing part is the changing person.
The chorus is sung in the second-person. i.e. "YOU can't hide YOUR lyin' eyes."
All the verses, except the very last one, are sung in the third-person. i.e. "SHE gets up and pours HERself a strong one".
The end of the last verse suddenly switches to the second-person. "YOU'RE still the same old girl YOU used to be."
It shows that this is not the first time "she" has cheated on someone, and the person she previously cheated on was the singer/narrator. The singer starts off kind of giving a play-by-play to try to distance himself from her, until his supressed emotions get the best of him and he lashes out directly at her.
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