I agreed with what told you to check about Borderline Personality Disorder.
This fact about favourite persons is a common thing in adolescente people and borderline personality disorder’s people are known for having self-defence mechanisms from early stages of maturity
I don’t mean you have this disorder. Maybe, it’s only a trait. Anyway, it doesn’t matter. People with this disorder may be treat. Please, don’t be afraid. There are lots of negative myths. Nothing to do with reality.
That’s only a thing of movies.