Why is my teacher ignoring me?

Well my teacher is ignoring me since 2 weeks. He is a great teacher and I am good student as well. I just don't know why. NOTHING at all happened that might make him start ignoring me this way. He won't even look me while teaching nowdays.

What do you think could be the reason?

I am sure nothing out of the blue happened. Its all been going the same.
Why is my teacher ignoring me?
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