Lyric discussion by kentuckygentleman 

Cover art for Stars and Sons lyrics by Broken Social Scene

Well, BSS is my favorite band and I've listened to them and this song hundreds of times and I always felt the explanation was simple~ You don't know where life is taking you or where you're supposed to go. You always wonder if the right person has already come and gone out of your life or if they're the next one you meet. Red is passion, sin, life, action, excitement. You feel like it hasn't happened, but the road to it is in fact the red room all along and the people you meet and love don't have the answer, you do.

Basically: Life is not an equation or problem to be figured out. Life is a confusing journey full of realizations and changes. Nothing is definite except death (and that is unpredictable)

My Interpretation