To understand MLC more, I've been steeping myself in literature on Carl Jung's theories on individuation. For those of us at a certain age, this is a period where we and our spouses reexamine the old truths and find out which ones we embrace authentically.
For familial and personal reasons, my W never quite achieved healthy individuation, which has led to certain resentments and annoyances as she expected me to live a life not authentically mine...and blaming me for her unhappiness.
At least that's my hypothesis, but to quote Nat King Cole again, "they try to tell me I'm too Jung."