What does it mean, if a guy is suddenly busy and doesn't know when this will change?

Lifechanging93
So got to know this guy on Tinder 4 weeks ago, had great contact, went on one date, actually wanted to see each other last week, but I had to cancel, because something for in my way. So we agreed to meet Saturday but he suddenly didn't know how much time he's have and that he might be very busy. When I asked him if he's still interested in getting to know me better, he replied he's very busy at the moment, left it vague when he might have time again & said "so because of this the answer to your question is no". I don't understand, why he suddenly is so busy... I told him I understand, didn't want to pressure him but would like to get to know him better when he'd be free again. No response since 3 days...
What's your experiences in such a thing? How can I deal now except of not contacting him again?
What does it mean, if a guy is suddenly busy and doesn't know when this will change?
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