Don't blame her, ask yourself what you have done for her,try to find out the problem, or have a talk honestly.
A husband may talk badly about his wife for various reasons, such as feeling frustrated or resentful in the relationship, seeking validation or sympathy from others, lacking effective communication skills, or having unresolved issues in the marriage. It is important for both partners to address underlying issues constructively and communicate openly to improve the relationship.
Honestly, I would say it to they're face!
probably an affair, or she doesnt trust you, or shes just not open
it turns him on... and if the wife wants him to talk nasty then tell him
John Howard openly says that his wife Jeanette is his best friend.
Talk to him. Don't tell his wife until you have talked to him, if your best friends he will appreciate that you went to him, and also talk to your wife.
try to talk to her
Dump her!
Honestly, it depends on the level of formality. And the occasion.
You should talk to your wife.
Barracks Obama likes to talk about his wife.