Like a shark.

A relationship, I think, is like a shark. You know? It has to constantly move forward or it dies. And I think what we got on our hands is a dead shark. -Woody Allen, Annie Hall, 1977

All broken hearts are circumstantial.

…all broken hearts are circumstantial. Every lovelorn jerk is the victim of bad timing, good intentions and someone else’s poor decision making.
Joshua Ferris, Then We Came to the End, 226