Possibly she was all for his joining the military in the first place ... but then vehemently against it when he rejoined in 2004. (I guess she offered to go with him to Canada). By that time he'd already established himself and even said "I want to go back and be with my buddies". He was not afraid of going back to Iraq.
Well, I was wrong. I just looked it up, she was not aware that he'd joined in 2000 and was totally devastated when he told her.