Make Time for Some Alone Time
If you want keep your lady hungry, make her miss you a little. We're not advocating ignoring her text messages to the point she thinks you've actually disappeared, but not being available because you're out having a life is a good thing.
You should pursue what makes you, well, you, and with a pre-relationship vigor. Whatever your passion might be, even if it's something you can't share with her, invest time and energy in it. A guy who has his own thing going on is hot. That's what attracted her to you in the first place. Maintain that, and you'll be sure to keep her attention. And while you're away, she'll remember what it's like to miss you. Consider your romance reignited.