Yikes. I suppose my first reaction is that I wouldn't have waited seven days. I mean, we argue and sometimes even need to go out to cool off a bit, but like I'll go to a friends for coffee, or he'll go have a beer with his buddies. Then we come home.
After 20 years of living together (17 of them married), he's never gone out all night or disappeared like that in anger. So if I didn't hear from him after a day I'd be frantically worried and would be looking for him, it would have been hard to stay angry.
If he refused to speak to me for 7 days, I'd know we had something serious to really work out, so I'd probably write him a letter telling him I love him and that I want us to work on things... meet to talk calmly, maybe see a counselor.