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The Friendship Formula
What It’s 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.
Three Key Ideas
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 a Sample
The Friendship Formula by Caroline Millington
Ten o'clock on a Tuesday night. You're on the couch with a glass of wine, scrolling through a group chat on your phone. You haven't replied to anyone in three hours. You've canceled two get-togethers in the last three weeks. Yesterday was your best friend's birthday, and all you sent was a quick WhatsApp, when you used to bake a cake. Something changed in your early thirties, and you can't say exactly when. You just know that work, the kid, your partner, your parents, and the weekly grocery run have slowly eaten up your energy. Friendship, once the center of your life, became an afterthought.
Caroline Millington's *The Friendship Formula* meets the reader at exactly this moment. The book grew out of twenty years of watching female friendships. Millington is a British journalist who worked at the *Daily Mail* for two decades and then at her own publications, seeing every day how women's friendships form and fall apart. *The Friendship Formula* isn't an academic treatise on psychology. It's a practical guide to looking at your social circles with Marie Kondo-style enthusiasm (which connections spark joy, which don't) and to handling the ones that don't.
What you'll get from the next forty-five minutes
In the next forty-five minutes, you'll understand why adult friendship thins out after our twenties. You'll meet the "drains and radiators" framework, the simple mental handle Millington gave modern readers. You'll learn how to spot a toxic friend, what "ghosting" means, and what a "frenemy" is. And you'll see why, after a spouse and a child, you talk to your best friend less than to a stranger at the gym. At the end come concrete exercises for reviewing your social circle tomorrow morning and letting go of people who've already let go of you.
Who It’s 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.
