There are tons of things to do at WDW for couples! You can do either a Wishes or Illuminations Cruise. That's a special boat cruise that takes you out onto the water to watch the fireworks show. I think you can get a boat for just the two of you, which gives you some nice alone time (well, besides the guy who drives the boat) with your BF.
There are also plenty of nice restaurants around WDW which provide a romantic atmosphere. The California Grill in the Conteporary Resort, IMO, sounds the nicest. If you make ressies, you can eat dinner during Wishes and watch it thru the windows. You might even be able to request a window table so you don't have to look over people's heads to see the show. Or there's even a balcony to view it from. This restaurant is expensive though, just a heads up.