It's common advice on this subreddit that being too available, needy, or invested diminishes your value in a relationship, and that leading a busy life and being sometimes unavailable is attractive (people want what they can't have). That being said, is there any danger to the other side of the coin? Can being too unavailable and hard to pin down jeopardize a relationship?

To apply it to my situation, I've been dating a girl exclusively for the last few months. She's a great girl, and I've enjoyed her company. But recently, she has expressed frustration with my unavailability as a result of different work, family, and social commitments. I'm genuinely busy, and I see her 1-2 times per week. Are her complaints cause for concern, or is this something I can brush aside?