Ruby
To be fair most couples don't exactly have problems of this...scope. Fighting though? Stubbornness almost making you both run screaming to the opposite corners of the earth? That sounds normal for marriage to a Winchester.
Not just demons Ruby. If I'd never met John, if I'd refused to marry him, just left him alone, he might have lived a long life and never found out about the supernatural. If he'd had children with someone else they might have had normal lives too. You just have to learn to accept some things. These are the lives we have. We can make them as good as we can but we can't trade them in.