When a guy stands really close to you?

KAZ-2Y5
so i was in plant science and some guy who is my PE class came in to my class during lunch asking my AG teacher why he had a D and what he could do to get it back up. When he was done talking to her i asked her about a packet i definitely got done and he said yeah i definitely got that done to. And she told both of to check the return boxes for our classes. but the thing is, is that he was standing anywhere from 5 inches to a foot from my face. anybody have any ideas what it might mean?
When a guy stands really close to you?
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