Empath:

An empath tends to take on the emotions of the people around them—good and bad—and tend to be highly sensitive people. They are strongly affected by their physical environments and by the moods and emotions of others. It’s not uncommon for empathetic and narcissistic personalities to be drawn together in relationships, because they absorb feelings from others very easily, almost like an emotional sponge. [psych central]. This same quality is often what attracts a person with narcissism. The more selfless and caring you are, the more the narcissistic person may see an opportunity to get their own needs met without having to do much in return. Also see Grandiose Narcissism and Narcissistic Projection