Why guys allowed their lazy wife's to over spend?

My cousin he is married to a Karen. My cousin no so long ago he finished law school and okay his a lawyer. We were close growing up since he is my same age but things changed when married Karen. Now he bought her a BMW she's always wearing new clothes , New shoes and not only that but Karen always takes my cousin's credit card. I had a serious talk with my cousin that he shouldn't allowed all this crazy spending. How he needs to have control of his finances still has student loans to pay and start saving and Karen has no right over his finances that I am worried and concern about him but no he always puts Karen first now he doesn't want to talk to me. I was only giving my cousin an advice. His wife hates me I just wanted to help my cousin I don't want to see him empty Pocket divorce later in the future. My cousin is 28 and I don't want him to get in debt so fats he took at all these credit cards just because Karen told him to do so.
Why guys allowed their lazy wife's to over spend?
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