I woudl stay in FT to set an example for him... He will take a sign of you ending FT to be you giving up on changing the marriage for hte better... YOU going to FT gives HIM HOPE and CONFIDENCE
If its expensive, cut back the appointments but ekep lots of books and articles around so he can SEE yo are working on the marriage still... you don't need to se a FT seven days a week, he just needs to see you are putting in the effort
