If my H defends me in an argument, that shows he cares about me and is on the same page as me.
I think 'Oi you, leave MY wife alone' is so sexy.
If he didn't stand up for me I would interpret it as uncaring, indifference, not thinking my problems were important etc.
A H defending me is my proof of his love and devotion, that he loves me so much he is willing to put his neck on the line with others to stand up for me.
