Contrary to what others say about the meaning of this song "snsd moving on forgetting about jessica blah blah... I think it's a song actually expressing their support for jessica. Like, we're now moving on separate/different paths but eventually all of us will reached our dreams, so let's keep on moving forward because the future still awaits.
"Never gonna look back,girls" I think doesn't mean they're going to literally forget about Jessica and their memories together, but more on telling themselves and Jessica perhaps, to not dwell on the hurtful past instead together let's boldly let go of our pains/worries and freely move forward, to whatever the future leads us. ^_^