Why did he turn red?

manifestation
I said hi to a guy that I'm definitely developing feelings for but when I said hi he first didn't hear because he had his head down. After I called out his name and said' I just said hi which you ignored (with a smile) and he went bright red. I felt bad because I don't whether I embarrased or like my previous bf he turned red because he likes me.

(He did say hi back and we did chat)
Updates
+1 y
Sorry I was meant to write... I felt bad because I thought I embarrassed him because it was near other people.
Why did he turn red?
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