As someone who used the "I don't want to talk about it" when I was "happily" married - it was easier for me to open up when we were playing - i.e. hiking, movies, vacations, car rides, etc. I know that sounds simplistic and I'm not as familiar with your sitch but I've found the suggestion "hold still and let the butterfly come to you" quite helpful.
Me 56 H 47 Married 21 years No children Bomb & moved out 4/07 "My feelings have changed" & "I want to live by myself". Ow Bomb 8/07 H filed 6/08 D final 2/05/10