To me, the commitment to your relationship sounds genuine. Sometimes displacing emotions can confuse us and maybe that is why we search for reasons behind our behaviors. Sexual attention is attention after all. Look to see what other kind of attention she appreciates, and continue to practice your own values- even if they go unappreciated. As we care for our relationships, we tend to loose sight of what we want too. Does she no longer communicate in ways that were effective in the start of your relationship? Maybe remind her of what your needs are. I’m sure she feels your attention to her, and maybe she is distracted in different ways by the realities and hardships of life. Together is better. Even if we don’t include ourselves or things about the negatives, we can work through issues with communication through actions, words and sometimes silence too.