Why does he turn red when I talk to him?

legalcheeky
There's this guy I met a couple of months ago and we got on really well, until I realised I liked him but wasn't sure he liked me. We used to talk always but we've stopped for about a month. I've seen him see me as I leave the lectures and I did ask him out but he couldn't come as he was genuinely busy. Yesterday, I decided to say hi to him (didn't hear me as he was looking at his phone so I called out his name and told him that he ignored my hi) when he said hi he turned bright red, according to my friends. I don't pay much attention to it because he's turned red before when chatting. Does he like me? Or is he not interested hence why he doesn't chat because usually now I start the conversation. Or intimidated (that's what my friends think) If not then I need to distance myself because the more I see him I now get nervous, shy and my feelings are growing.
Why does he turn red when I talk to him?
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