How do I deal with my growing resentment towards my unemployed wife?

I have been married for 15 years and although I love my wife very much, I am starting to resent her for not working since we had our child (8 years old). As a parent she wanted to take care of our child herself and that was normal but it has been 9 years. I have worked all this time, taking on all the financial pressure but she seems happy to stay at home. I have hinted to her, I have asked her to go back to being a doctor but she is not interested. As much as I want to keep us together, the frustration is eating away at me and I don't know what to do.

How do I deal with my growing resentment towards my unemployed wife?
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