She listened in the background. She originally wrote the song, originally it was a song he sang with her, but now, it was indeed him singing it with someone else... When she came on stage, she asked him with the song if it was true, but he didn't even look at it. She understood, and she left...
And he, waiting for her to come back, come back and listen to his explanation,
But when she really came back, he couldn't explain it...