I think this song is about a guy who gets broken up with, and wants the girl to be happy, so he doesn't show her that he's hurting inside, but he ends up hurting so much that he just can't hide it anymore. And these lines were missing at the very end, which I think is the best part of the song:
I don't know how I can face this pain
I'll keep it inside so you can't see
I don't think I can go on this way, 'cause it's not me
I think this song is about a guy who gets broken up with, and wants the girl to be happy, so he doesn't show her that he's hurting inside, but he ends up hurting so much that he just can't hide it anymore. And these lines were missing at the very end, which I think is the best part of the song:
I don't know how I can face this pain I'll keep it inside so you can't see I don't think I can go on this way, 'cause it's not me