Why didn’t he want to talk to me, is this rude of him?

I wanted to talk via phone to this guy I’m friendly with, I like him and I said to him are you free to talk? And he said ‘not now, I’ll let you know sometime soon’…I was a bit taken back and I think it’s a bit rude of him. I didn’t respond and I get he’s busy etc but still, why couldn’t he spare a minute to talk to me?

Why didn’t he want to talk to me, is this rude of him?
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