Please study detachment. It isn't pretending that you don't care. It is getting to a place where her words and actions do not affect you emotionally. It is really a healthy place for an individual to be, even an individual in a committed, loving relationship. Google "self-differentiation in marriage" for another take on it.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018