Could someone please explain how my wife's mind works?

I was a good husband for a lot of years. Over the last year or so my wife basically got bored with me, culminating in a series of almost-mistakes with younger men. I confronted her about everything and she broke down and said she was unhappy and I no longer excited her. She questioned my masculinity in not so many words. I pointed out that I was a good husband, took her out frequently, did a lot of housework and other chores for her without her asking, helped her with her wardrobe and a lot of other things that I thought made me a "good man." I had always done these things since we were in our teens. She couldn't explain any of it but said she felt how she felt. Well I quit a lot of that, gradually over time, and now basically pattern myself as a husband in that "King of Queens" style that involves laziness and a lack of real responsibility. I thought I was doing something outrageous but it seems to have worked and more than that some female friends/coworkers think it makes sense (though one disagrees and has stuck to the line that I should have kept being a good husband even if my wife was unhappy with it, which makes no sense to me). She's happier than ever and rewards me in the bedroom, though I think she remains unaware of how I changed. It's been 7 months since I made the change. Can someone please help me get this?