How I felt when I wrote ‘21,’ I wouldn’t want to feel again. It was horrible. I was miserable, I was lonely, I was sad, I was angry, I was bitter. I thought I was going to be single for the rest of my life. I thought I was never going to love again. It’s not worth it. […] Well, it was worth it, because, obviously, of what’s gone on. But I’m not willing to feel like that to write a song again. I’m not. I haven’t got time to fall apart.