We all have that one friend. The one who expects the world, but never remembers your birthday. The one who ditches your dinner plans when you’re already halfway to the restaurant. The one who leaves you feeling exhausted, used and emotionally battered.

Why do we keep these people in our lives? How do we go about getting rid of these crappy companions?

Neuropsychologist Dr Hannah Korrel is an expert in why our brains make us to, or not do, certain things, and she’s written a book to try and answer the questions I just asked.

Dr Korrel’s new book How To Break Up With Friends is available today. She joins John Stanley.

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