Guys, is it ALWAYS true that when you don't call a girl, you're just not interested?

I'm not asking to defend someone's behavior or anything, I'm just curious. Is it always the case that when a guy gets your number and doesn't call (regardless of whether he's known you five minutes or five months), he doesn't like you? Are there any other possible, but less likely, reasons for not doing so (such as being swamped with work, simply being too nervous, forgetting your name/losing your number, etc.)?

Now, I'm sure in most cases that the guy simply ghosts because he's not interested. I am wondering, however, how many guys have done this unintentionally.
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Guys, is it ALWAYS true that when you don't call a girl, you're just not interested?
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