I don't know if "going dark" is necassary. Maybe just be less available and accomodating. Be unavailable, then suggest another time. Or simply say "Let me check my calendar and get back to you" before agreeing to meet up. (I wouldn't do this regarding issues with your D, of course) Be friendly, don't explain, and see how she reacts. Others might have more experience with this than I do. PS again - lexapro sort of does that. It's probably a good sign that you feel good or bad about other things, but can handle the stuff with your W with some detachment.