What does the song "If you don't stay, don't look back" mean?

Don't stay, don't look back, the lyrics mean I won't stay, and you can't hope you can go back and face me. Just let yourself go, no one will feel the same way.

I want to meet people I can't see, and I want to do things I can't do. Why should I finally wait for you not to look back and cherish everything in front of me? "I thought I would never let go of my hand, but now I have nothing. I didn't stay and you didn't look back. "