Why does my teacher blush around me?

Anonymous
Why would a grown man blush around a young woman all the time even though he wasn't attracted to her?

My teacher, he's in his fourties and I'm seventeen and he blushes when he talks to me and when I'm around him. However I know that he isn't attracted to me

For instance he was in the room teaching 2 other guys in an extra catch up class and was talking to them and then when I walked in and sat down to join the 2 guys in the class he started blushing and then started rubbing his face lots but I could still tell he was blushing

When he talks to me sometimes I will see that his face goes red and this happens most times he's around me

I know he's not attracted to me because he's a teacher and it's not professional to have feelings for a student. So do I intimidate him in some way?
Why does my teacher blush around me?
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