A relationship needs constant attention. It’s a living thing, not just a habit. You’ve got to keep on top of it.

Matt Dunn

Because that's what unfaithfulness is, isn't it? A cancer that's always there in the back of your mind, eating away at the foundations of the relationship. It's happened once, it could happen again, so you're always looking for telltale signs or symptoms to show that it's reappeared.

Matt Dunn