Can someone answer my questions about Facebook?

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I friend requested someone and they HAVEN'T accepted it. (It says friend request) Does that mean they put "Not now" or does it mean they haven't responded AT ALL? Cause not now means you'll decide later. So did this person put not now or not respond at all yet?

Can I cancel my friend request and re send him another one? The reason I want to do this is because maybe he forgot about adding me and this time he'll add him. I'm asking can I not should I.

Bonus Question: This person I added was my former teacher. He's really cool and I'm not trying to be a creeper by adding him. He's added a bunch of students. I stopped by and chatted with him and he seemed really happy to see me. So why hasn't he accepted me yet? Last time I checked he's been on. Should I re send him another request?