Why did he react like that?
What Guys Said 1
Well I only go stiff when I see a sexy girl. Your friend probably likes him if she is checking out his stiffy.
What Girls Said 1
He's probably just embarrassed because of what he said to you. And Doesn't want to have to talk to you and have you ask him any questions about his actions, so he looked away to avoid any sort of eye contact that might initiate a conversation.
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