Lyric discussion by PleinlyStated 

Cover art for Do What You Have To Do lyrics by Sarah McLachlan

I have read several comments and respect them. I think this song is about lost love, and the vulnerability of admitting to the loved one that there has been a betrayal of neglect, which hurts so much, because it is foreign to the essence of pure love. Sarah is singing about the travails of recognizing that the loved one has neglected and harmed the subject, and doesn't seem to care. However, it's important for the subject to communicate the depth of the damage. The subject is ambushed by the neglect, and doesn't know how to cope with it, yet feels it's important to convey the pain. Moving on is not ideal, but also a recognition that the love interest of the subject has already done so, but failed to consider the feelings or damage of the subject, by neglecting to share.

This is a very sad song, brilliantly written and sung to express the heartbreak that is the theme.

My Interpretation