Why don't teachers/professors get attached to students?

Why is it up to students to keep the friendship going and not the professors/teachers? Some of my teachers and professors seemed to have such good things to say about my work or my personality, but even though they still would have my email address, my inbox is empty. Movies like Matilda or Harry Potter are really misleading.

Why dont teachers/professors get attached to students?
Why don't teachers/professors get attached to students?
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