So many who have walked in and out of a person's life, and never even realized it. They won't think about it ever again, and will therefore never regret it. They lack awareness of their actions, and the repercussions of their actions. They lack a beginner's mind and a focus on now. They will wander through the rest of their life thinking that something is missing, but shy away from the one place inside of themselves where they know it is, since it would mean that the map they've drawn for themselves is flawed (and needs to be corrected). They shrink from change because it is often painful - they forget how healing always hurts, like the bone that must mend, or the wound that must close. They become complacent and self-satisfied, arrogant and smug.
You deceive the best parts of yourself when you tell somebody that you cared, when you never did; you deceive yourself when you believe that you are wedded to the people fate has cast upon you; you camouflage the light for the comfort of darkness. You refuse to move on - you prefer the lifelessness of stagnation and decay.