I think it's about setting aside quality time with your SO, so that she feels heard and paid attention to. Quality time isn't watching a tv show together in silence, nor going out with the same group of friends, rather it's more about no distractions, just you and her. But if your work schedule takes up so much of your time that you rarely see her, then that's a problem (and would be for just about anyone). LTRs are like a plant, gotta water it.