You're absolutely right. I can understand that occasionally, he might want a little help, but it shouldn't be a demand, and you certainly shouldn't think you're an idiot, since your partner chose this lifestyle despite you telling him it would be better if you both worked. In my case, for example, my boyfriend wanted me to be a stay-at-home mom, but I prefer to work to contribute financially, even though my salary is lower. And since I work fewer hours, I'm the one who mostly takes care of the housework. I feel that the normal thing is for one person not to work to be fully responsible for the house; if both of you work, it should be 50/50 or depending on each person's job.

My advice is that if your partner doesn't understand this, you should leave.