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The Friendship Formula
Caroline Millington
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What is The Friendship Formula about?
How to build, repair, and exit friendships as an adult. Caroline Millington walks through the social skills nobody teaches: making friends after 30, navigating toxic dynamics, recognizing one-sided friendships, and rebuilding after a falling out. Direct, modern, and unusually honest about the politics of female friendship.
Key ideas of The Friendship Formula
Drains and Radiators Framework
Every person in your social circle either drains your energy or radiates warmth, and naming the difference is the first step toward healthier friendships.
Adult Friendship Takes Active Work
Research shows it takes roughly 200 shared hours to form a close friendship, so adult connections require deliberate, consistent effort to reach that depth.
Releasing Toxic Friendships
Letting go of a friend who causes regular harm is not cruelty but self-care, and slow withdrawal is more effective than confrontation.
Read an excerpt from the summary
The Friendship Formula — Caroline Millington
Tuesday night, ten o'clock. You're on the couch, a glass of wine in hand, scrolling through a group chat on your phone. You haven't replied to anyone for three hours. You've cancelled two meet-ups in the last three weeks. Yesterday was your best friend's birthday and you sent only a quick WhatsApp — whereas you used to bake a cake. Something changed in your early thirties and you don't know exactly when. You just know that work, the kid, your partner, your parents, the weekly shopping have slowly devoured your energy — and friendship, which used to be the center of your life, became an accessory.
Caroline Millington's *The Friendship Formula* finds the reader exactly at this moment. The book is the product of twenty years of female-friendship observation from a British journalist who worked at the *Daily Mail* for two decades, then at her own publications, watching daily how women's friendships form and unravel. *The Friendship Formula* isn't an academic psychological treatise. It's a practical guide for looking at your social circles with Marie Kondo–like enthusiasm — which connections spark joy, which don't — and how to handle the latter.
What you'll get from the next forty-five minutes
In the next forty-five minutes you'll understand why adult friendship thins after our twenties. You'll meet the "drains and radiators" framework — the simple mental handle Millington gave modern people. You'll learn how to recognize a toxic friend, what "ghosting" means, what a "frenemy" is, and why after a spouse and a child you talk to your best friend less than to a stranger at the gym. At the end you'll get concrete exercises to review your social circle tomorrow morning and release what's already released you.
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Continue in the appWho is it for?
- Anyone who feels their close friendships have quietly thinned since their twenties and wants to understand why.
- Anyone who suspects one or more people in their social circle may be draining rather than energising them.
- Anyone who has moved cities, had a child, or entered a long relationship and found their friendships slipping away.
- Anyone who wants practical, direct guidance on making new friends as an adult and maintaining the ones that matter.
About the author: Caroline Millington
Caroline Millington is a British journalist and author who spent two decades at the Daily Mail before moving on to her own publications. Her reporting career gave her an unusually close vantage point on how women's friendships form, change, and break down across different life stages.
Her first book, Kindfulness, focused on self-compassion. The Friendship Formula extends that work outward, applying the same clear-eyed honesty to the relationships we build with others.
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