marriage with psychiatric complication

If a man is married to a woman who is not of sound mind, and he cannot be fulfilled, what is he halachically permitted to do?

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Shalom rav,

The medical information lacking is that the woman as diagnosed with manic depression about 9 years ago, due to acute post-partum depression. She functions on a limited level, doing only the basic necessities. Most of the household duties are left to her husband.

Thank you for your quick reply.

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The question is: "How can he be fulfilled in matters of Ishut "?