When a guy looks over his shoulder at you?

so i was in my P. E. class today and I was sitting with my friends in that class and a guy sitting in front of me just randomly looked over his right (i think it his right) shoulder and made direct contact with me and when i looked back we had eye contact with each other for about 2 seconds then he looks away. He definitely initiated eye contact. not only that he is always such a gentleman to me and for a while he never really styled his hair but very recently he cut and started styling his hair. i am probably over thinking this but it never hurts to know.
When a guy looks over his shoulder at you?
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