Not "Just Friends"

“ Eighty-two percent of the 210 unfaithful partners I've treated have had an affair with someone who was, at first, 'just a friend.' e.style.display='none');if(typeof getContentsSections==='function')setTimeout(getContentsSections,50)" /> The book's central thesis is that today's affairs aren't premeditated seductions — they grow gradually from workplace friendships and social connections.

“ Eighty-two percent of the 210 unfaithful partners I've treated have had an affair with someone who was, at first, 'just a friend.' e.style.display='none');if(typeof getContentsSections==='function')setTimeout(getContentsSections,50)" /> The book's central thesis is that today's affairs aren't premeditated seductions — they grow gradually from workplace friendships and social connections. Like the frog in slowly heating water, people don't notice they've crossed the line until it's too late. Ralph, a devoted husband in the book's recurring case study, drifted into an affair with his colleague Lara over months of shared lunches and deepening conversations — all before a single kiss. The slippery slope progresses through four steps: platonic friendship, intimate friendship, emotional affair, sexual affair. Each felt minor at the time. Among Glass's 350 clinical couples, 62% of unfaithful men and 46% of unfaithful women met their affair partners through work. The danger isn't attraction — it's acting on it through incremental boundary erosion. TAKEAWAY 2

“ When a friend knows more about your marriage than a spouse knows about your friendship, you have already reversed the healthy position of walls and windows. ” e.style.display='none');if(typeof getContentsSections==='function')setTimeout(getContentsSections,50)" /> "Walls and windows" is the book's signature framework for diagnosing relationship boundaries. In a healthy marriage, partners share an open window of honesty between them and maintain a protective wall against outside threats. During an affair, this architecture flips: a wall of secrecy rises between spouses while a window of intimacy opens to the affair partner. To assess any friendship, ask yourself: Am I sharing things with this person I'm not sharing with my partner? Am I keeping details of this friendship secret? If you're building walls inside your marriage and opening windows outside it, you've entered the danger zone — even without a single romantic gesture. Recovery requires physically reversing this architecture: total transparency with your spouse and a firm, opaque wall with the affair partner. TAKEAWAY 3

“ Sometimes the explanation is as simple as attraction, opportunity, and failure to follow precautions. ” e.style.display='none');if(typeof getContentsSections==='function')setTimeout(getContentsSections,50)" /> Glass calls this the Prevention Myth — the widely held belief that being a loving, attentive partner immunizes your marriage from infidelity. No research supports this. In Glass's airport study, 56% of unfaithful men and 34% of unfaithful women rated their marriage as happy. Unfaithful husbands in primarily sexual affairs were just as satisfied with their marriages as faithful husbands. This myth causes real harm. Betrayed partners blame themselves, asking "What…