Thanks for checking in. I see detaching as moving away emotionally so they can't hurt you with their actions whilst still keeping them in your heart.
Going dark is another thing altogether, something that is nigh on impossible in your sitch. You can, as WIT says though, GAL, act aloof, above it all, not bothered, moving on etc etc.
WIT I aint giving you a 2 x 4 for that, I agree with you