It talks about he's under the control of another person, and he wants to be more dependent and be like himself.
https://www.youtube.com/watch?v=kXYiU_JCYtU
A fragment of the song:
"Can't you see that you're smothering me?
Holding too tightly, afraid to lose control
'Cause everything that you thought I would be,
Has fallen apart right in front of you
(Caught in the undertow, just caught in the undertow)
Every step that I take is another mistake to you
(Caught in the undertow, just caught in the undertow)
And every second I waste is more than I can take"
