Ever noticed how they can be all nice as pie on the outside, and totally different on the inside? Women are world-class champions at concealing their feelings.
However, they loathe having to do it and despise you for being fooled. What she wants is "to be able to be myself". To be able to lay as much shit as she wants on someone without facing consequences.
Get it? To a woman, slack is having someone else to treat badly.