Well, ask yourself if you really work 24/7? Don't even have time
to pay some attention to your gal? For example, you do have in
between waiting time for transport/meals/toilet
break/daydreaming...you could use those spare time to give your gal
some attention and care for her. Certainly all your gf need is some
concern from you, be it half-hearted or not...it does makes her
still feel IMPORTANT to you.
She probably wants to know everything about you, and all you need
to do is just to LOVE her. No need to try to understand what she's
thinking...you won't be able to guess it anyway, and she will
probably deny it even if you're correct. 
Good luck.
