You should respectfully request that your wife not do that any more. In a marriage, if your spouse does
anything that upsets you, whatever it is, she should not do it once you ask her to stop. However, if your marriage is rocky, she might not respect your request and might feel that you are trying to control her and deprive her of the support of friends. If she refuses to stop, you should not turn your request into a selfish demand by being angry, sulking, or in some other way punishing her.
The problem is that a complaint, even when conveyed with the utmost respect, is an irritation in a bad marriage. The spouse that has fallen out of love will see no reason to be considerate or do anything for the other spouse, and will be living her life with a great deal of independence - pleasing herself and not caring how unhappy you are.
You should make your request that she not discuss your marriage with friends - but in fact, that is only a symptom of the rocky marriage that you mention. Your marriage will still be rocky if, for some reason, she stops talking to her friend immediately.
What are the problems in the marriage that make it rocky? How long have you been married, and do you have children? Has there been an affair on either side? Do you argue and fight, and if so, about what issues?
Have you read the free materials provided by Dr Harley on this site, particularly
How Dr Harley Learned to Save Marriages, and the
Basic Concepts? You need to understand the basic concepts, and how they all work together in a marriage, in order to understand the role that Love Busters are playing in your marriage. You need to identify the love busters you and your wife are committing against each other, and learn how to stop them, and get your emotional needs met, so that you are both happy and in love for life.