^Apathy is veiled anger. Depression is anger turned inward. All
  anger is, at its core, a dark and cruel wish for harm to come
  upon the person who hurt you. Vengence is a common, boring way
  to resolve anger. Self-sabotage inflicts guilt on those around
  you - a strangely satisfying form of vengence based on anger
  turned inward. (my paraphrases)^