That's awesome!!!! Several years ago, my boyfriend went vegetarian because I wouldn't ever let him bring meat into my apartment. He agreed to go vegetarian, but said he'd never do that "vegan thing". When I decided to go vegan almost two years ago, he supported it and said he would try it for 30 days, but he reserved the right to go back to vegetarianism and that I would never catch him checking the back of a package for non-vegan ingredients. Fast forward almost two years and we're both very happy vegans and let me tell you, he's the first one to turn a package over and look for the "hidden" ingredients (whey, casein, etc.) that we can't have.
It will make it much easier on you if he'll try going vegan with you, but if he doesn't right away, when he tastes all the delicious vegan food you're eating, I bet he'll be hooked!