Going along with not resting on your laurels and expressing appreciation, you should continue to show gratitude throughout your relationship. Not bowing and scraping and thanking him for having you but paying attention to the small details.
- Keep things that he likes in your daily life (maybe not cigars and hockey but don’t exorcise his possessions from your life).
- Small surprises to shake things up (a spicy text message, pvr-ing the game, cooking his favorite meal).
- Let him know how much you value him (although not in a creepy, stalker-ish kinda way).
You must keep your relationship a priority, even when the bloom is off the lily. If you take someone for granted, they’ll feel it. Treat them like they’re gold and they’ll feel that too.