Should I make myself less available?

I'm dating this guy. we've only been on a few dates because he works full time and is going to school to be a pharmacist. needless to say he hardly ever has free time. so when he wants to go out he always calls me the night of. should I always go since his time is limited and I'm scared that's the only time I'll get to spend with him? or should I do what most girls suggest and make myself less available?
Should I make myself less available?
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