My SO is veggie too, and I like not having meat in the house. I guess I'm a slightly atypical veggie -- I LOVE LOVE LOVE the taste of meat. Sausages with mustard? Yum? Big ole juicy bacon double cheeseburger? Yum! I really miss these foods occasionally, but fortunately there is great veggie sausage (Gimme lean is good for my periodic sausage cravings) and lots of other wonderful veggie food and, well, this will sound incredibly corny, I think of vegetarianism as one small way of limiting the amount of suffering* in the world, 'cause there sure is a lot these days. Also, several members of my family had heart disease. One more "also" - dried beans are a heckuva lot cheaper than steak!
* There are some decent meat options these days -- other than the act of slaughter, truly free-range animals live pretty good lives for the most part