A growing number of women report experiencing a specific form of relationship heartbreak, characterized by a partner's prolonged reluctance to commit to marriage or children, only to see him later embrace these commitments with someone else. This phenomenon has been colloquially termed 'doing a Jon Hamm,' inspired by actor Jon Hamm's past relationship.

Hamm, 55, recently announced he is expecting his first child with wife Anna Osceola. This comes after an 18-year relationship with actress Jennifer Westfeldt, during which he famously stated he did not possess the "marriage chip" and expressed disinterest in fatherhood. His subsequent marriage and impending fatherhood with Osceola have highlighted a pattern that resonates with many women.

Women sharing their experiences describe investing years into relationships, supporting partners through career changes and financial endeavors, while continuously facing delays or philosophical objections regarding marriage and starting a family. The narrative often involves a partner who positions himself as undecided or not yet ready, using phrases like "one day" or "not yet," which can trap a woman in a prolonged state of hopeful waiting.

One account details a woman named Sophie, who spent eight years with a partner who avoided defining their future. Despite her desire for a family by age 34, he expressed reservations about fatherhood. Shortly after their relationship ended, he became engaged to another woman who became pregnant. Sophie later discovered she was pregnant on social media while at a fertility clinic to freeze her eggs.

Another woman, Emily, ended a five-year relationship at age 37 after her partner consistently created new hurdles to marriage and children, such as buying a home or advancing his career. He eventually stated that the pressure for commitment was a "turn off." Nine months after their breakup, he was expecting a child with a new partner he had begun dating shortly after their separation.

These experiences underscore a pattern where women invest their reproductive years and emotional energy into a relationship, only for the partner to find readiness for commitment with someone new. The timing of these new relationships often suggests that the previous partner had completed an "emotional apprenticeship," with the new partner receiving the benefits of a more settled individual.

The author of these observations notes that this particular heartbreak cuts deeper than a standard breakup, involving grief for the years spent taking a partner's indecision seriously. The phenomenon is often explained away by psychological complexities or individual growth, but the underlying reality for the woman left behind is that a choice was made, just not with her.

Experts suggest that when a man expresses reluctance about marriage or children, women should take his words at face value. Investing remaining fertile years into a partner's indecision process is described as a costly endeavor, particularly when it leads to training that partner for someone else. The advice given is to stop viewing a partner's reluctance as a challenge to be overcome through patience, and instead to believe their stated desires regarding commitment and family.

Jon Hamm and Jennifer Westfeldt in 2015 A woman reflects on past relationships