Who says you get bored with your partner? I think that with a bit of creativity you can continue to evolve together and come to appreciate each other even more with each passing year.
Just keep it exciting, do things that you didn't do before, visit new places, make new friends, make new plans and most of all, always look for the good things in each other :)
You will get out of your relationship what you put into your relationship, never stop dreaming of an even better future together !