Answer: Personal fable
Step-by-step explanation:
Personal fable is defined as the value usually followed adolescent that they are unique enough that any situation in life will impact them differently irrespective of their action and behavior in any particular situation.It makes them feel the center of attention of any situation
According to the situation mentioned in question, Barbara is thinking that she has faced unique break-up and so her friends won't be able to understand her pain.She is focusing herself as unique and making own-self center of attention.This is denoted as personal fable.