Can it be done!?

This girl I'd seen 3 times, started getting annoyed when I said 'maybe' about going out again....and how she was surprised I only made the effort to see her once a week

I tried to explain that my work is unpredictable, and so cant go commiting much....the truth, and that I have other hobbies car,bike, gym etc

She was really annoyed, seemed to think we were a couple after 'a whole month'...counting the days!?

Anyway, is there any way of letting them down gently....not attractive a clingy girl!