Treat her with consideration. At least as much consideration as you would give your friends, or your mother. Make time for each other.
Good manners are important, always. (Please and thank you and all that.) Kindness is, too.
Once in a while, remind her of something you remember from an early one of your dates, or compliment her on one of the traits that was/is important to you.
A wedding isn't the finish line; it's the starting point. Love takes nurturing. But it's well worth it.
