Silent treatment is ruining her marriage
Your husband is not the only person to brush things under the carpet. I suspect if you took a look under your carpet you would find a multitude of issues -- some put there by you. As long as you see every issue in your household as being your husband's fault and responsibility, you will never find resolution. If you see initiating a conversation as a form of surrender, you will never find peace.
See a counselor or mediator who can help you two come to terms. And if you cannot, then I do think your marriage is over.
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