What do you know with your heart?
In an abusive relationship your heart is systematically trashed and vilified. You walk, or limp away feeling that your heart is worthless because that is the way it has been treated.
And so you put your trust in your head. Because your head must be clear and rational, must it not? That is what heads are meant to be, after all.
Yet your head will not lead you out of the impasse. Such wisdom as you hold in your head stops at the jaw bone or the neck.