I was a way of letting go. Once she threw it in the ocean, she was able to pass away and be with her true love. i wont explain but i would just say (heart of the ocean->rose), (ocean->jack dawson), (brock lovett->caledon hockley). thats why rose didnt give that diamond to brock.
Definition of post-traumatic stress disorder for English Language Learners medical: a mental condition that can affect a person who has had a very shocking or difficult experience (such as fighting in a war) and that is usually characterized by depression, anxiety, etc.
PTSD is a debilitating condition that can occur after exposure to a terrifying event or ordeal in which grave physical harm occurred or was threatened. Traumatic events that can trigger PTSD include violent personal assaults such as rape or mugging, natural or human-caused disasters, accidents, or military combat.