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.
Often, it could be that the wife discovers the husband's secrets and exposes them to cause a rift. Another way could be by the wife building a new life and making the husband feel unnecessary.
In many cases, it's okay. Reading manga can be a form of entertainment and relaxation. As long as it doesn't interfere with his responsibilities or your relationship, there shouldn't be a problem.