I'm slipping away
In every way
I can't stay awake
(and I don't know why)
I'm slipping away
(and I don't know why) [ Lyrics from: http://www.lyricsmode.com/lyrics/s/sum_41/slipping_away.html ]
I'm trying to make it through each day
I'm falling apart now in every way
I'm finding it harder to get by
There's a hole in my heart
And I don't know why
Now I've come to realize
Basically it's pretty self-explanatory. He's 'slipping away' from life as somethings happened to him, looks like he's been dumped by his girlfriend or something. But he's just completely broken down.