Relationship does not mean only sex (I think that is what you mean by intimacy and romance). You have to nurture it with love, understanding and passion. Even if you may not get time to have sex, you can talk, share and laugh together. This will strengthen your emotional bond. Women value communication, sharing, and emotional warmth more than sex. For them sex is a byproduct of this. So try to shift your focus on those things rather than sticking to sex all the time.