The saying is true "absence makes the heart grow fonder" If you allow time to be missed your love will grow.
My husband doesn't travel for work often but he was gone last week, and I missed him...terribly. We have been together for over 20 years and when he returned home I told him that I recognize how nice it is to miss him, the fact that I sill like him is evident. You may laugh at that, but hey, let's face it, when your together for a long time, sometimes you can focus on the little everyday things that irritate you or you may complain about the simple small things, but, remove yourself for a week and you tend to miss the person.
Now, I'm not saying you should go away ofter (you hear me my dear husband?) But, a little trip here or there is good for the marriage.