Are medical students really too busy to date?

I recently met this great guy, who happened to be a medical student. We went on about 4-5 dates and both of us have expressed to each other that we've had great times during those dates. However, the semester has started, and no call/text from him for over 2 weeks now. Should I just let him go? He offered no hint that he didn't want to see me the last time we saw each other, and even said he would get in touch with me.
Are medical students really too busy to date?
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