Compatibility is the cornerstone of every relationship without which the relationship may not last too long. Many people may have to go through a series of failed relationships to eventually find a partner that he or she is compatible with. However sometimes people with different or conflicting personality types stay trapped in a relationship together without realising that they are destroying each other in the process. One such dangerous combination is that of a dependent or a codependent personality with a narcissistic personality. Leading psychologist Dr Sanjoy Mukerji weighs in with his analysis on how this pair is a disaster