Are you saying that you were fine with how things were set up, until she called a halt to the intimacy? She could have no responsibilities and just do what she loved.....which was art, and you would cover everything.....just as long as you had the sex life. When the sex stopped, there wasn't much left in the MR for you, is that what you are feeling? You are doing all the giving, but she's not giving anything back. She's just doing her art.
I'm glad you spoke honestly about looking at certain sites and the women who post a profile. Do you have any experience in dating sites, finding friends, Fbuddies, affair hookups.... or whatever they may call themselves? Please, please don't go there. You may be seeking a temporary fix, but it can lead to problems you never anticipated.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!