SPOILER ALERT: Don't read unless you have read up to the first three pages of Chapter 28 in A Discovery of Witches.
If it were me, I'd be like "Oh Matthew dear...I'm just going to sit here in your huge bed and let Marthe bring me baked goods and flavored decaf (not a tea drinker) whilst you run around the forest doing...whatever it is that you do. Maybe I'll even do some clothes shopping with OM (which I am truly hoping happens at some point. How delicious would that be??) Catch ya later!! Let's meet back up for some good lovin' and a back rub around 4. Ok....break!"
Now back to the "husband/wife" part. I'm only 3 pages in to the chapter so I don't know much - but Matthew finally revealed to Diana that - in the vampire world - they are married. Yippee! Works for me! He's gorgeous - splendidly rich - worships me - and will never NOT be hot because he's a vampire. My god - it doesn't get any better than that! And if he decides to run off with a younger witch down the road...girlfriend can take HALF! ;)