Here's a cute and clear video explaining the concept of transference - the idea that we transfer what we learned from our past relationships on to our current ones. "Working through" transference is a major part of psychotherapy because it helps us make decisions based on what's actually happening now, rather than what might have happened in the past.
Transference is a very useful word from psychoanalysis which describes the process whereby we react to situations in the present according to a pattern laid down in the past, usually in childhood. Getting to know our own particular transferences is part of becoming a sane adult.