Lyric discussion by loganhd 

Cover art for Ache lyrics by James Carrington

I absolutely love this song. You can just hear how much he cares for the person he's singing it to. Anyway, I think it is pretty self explanatory. The relationship he is in is not working out so well and he finally realizes how much this person means to him. He is basically apologizing for all the things he didn't say to her because he just now understood how much he needs her.