If you do not give attention to your spouse and spend time with them because you think that they will always be there, you may find out one day that they are not. You need to take the time to be kind, thoughtful, appreciative, respectful, and affirming when it comes to how you treat your spouse.
Not taking your spouse for granted does not mean that you remember their birthday and your wedding anniversary. It means that you are tuned into what they feel and think. You really listen to them without interrupting. You show them your love for them as well telling them of your love for them.