It's highly unlikely to be a true story. Titles like this are often used to draw people in and are part of fictional storytelling. Real-life situations aren't usually packaged with such dramatic names.
One possible plot could be that the husband is having an affair at work. He acts all loving and perfect at home, but during work hours, he's involved with a colleague. His wife might start to suspect when she notices changes in his behavior, like being more distant or getting calls at odd hours.
I'm not sure specifically which 'Betrayal the Perfect Husband' real story you are referring to. There could be many stories with such a title or concept. It might be a story about a woman who discovers her seemingly perfect husband has some dark secrets like having an affair or being involved in illegal activities.
One possible motive could be a lack of emotional connection. Maybe the wife felt that despite her husband seeming perfect on the surface, they didn't truly understand each other on a deeper level. Another reason might be a mid - life crisis. She could be feeling unfulfilled in her life and made a bad decision as a result.
It can shatter the family structure. The trust between the couple is broken, which can lead to arguments, separation or divorce. If there are children involved, they may become confused and traumatized by the sudden change in the family dynamic.
The 'Betrayal the Perfect Husband' true story likely involves a situation where a seemingly ideal husband turns out to have a side that betrays the trust of his partner or family. It could be about infidelity, hidden secrets, or some form of deception. Without more specific details, it's hard to say exactly what occurred, but often in such cases, the discovery shatters the perception of the perfect relationship.
A perfect husband in the manga could be characterized by his loyalty, good communication skills, and the ability to share responsibilities. He'd also show love and respect consistently.