Two voices run through these few lines, and they don't agree. The ones in quotation marks sound like words spoken out loud, probably by someone else: "I don't want 'us' anymore," "I don't feel the same as I did before." They are blunt, final, and cold. Between them, in plain text, the speaker answers in fragments: "it all changed," "I do," "again and again."
The quiet "I do" is the emotional center. Where the other person says they no longer feel the same, the speaker admits that they still do. That gap is the heartbreak. The last two quoted lines, "I was wrong" and "I want you back," could be words the speaker wishes to hear, or words they keep replaying in their head. The poem doesn't say which, and that uncertainty is part of its pull.
The mood is raw and hollow. The short lines feel like someone struggling to say much at all, stuck in a loop of memory and hope.