Spouse keep changing every other month

We have been married for 6 years, after so many years of wondering why I’m a bad husband; I start thinking- my wife ask me what her favorite food was and this is when a light bulb went off, I didn’t know because every month or so, she changed, her food changes, different diet, different hair and skin products, want a new house, want a new car etc, any change she makes, goes away with the next change, I can’t keep up and look like a fool; please help!! What is this condition? She 14 years younger and says I’m stuff in traditional way of life