Huh, so he calls me up and he's like, "I still love you"
And I'm like, "I just, I mean this is exhausting, you know
Like, we are never getting back together, like ever"

from Taylor Swift – We Are Never Ever Getting Back Together Lyrics on Rap Genius

Meaning

Her on and off boyfriend calls again, and says that he still loves her.. she doesn’t know whether to believe him or not and explains how she is exhausted of him not being able to make up his mind. she finally tells him for the last time that they are never going to go through this vicious cycle ever again. she speaks as though she is actuallly talking to him on the phone which helps you to connect with the lyrics, and also make them more catchy but kind of take away from the poetry of the song.

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