Why is my old guy friend nervous around me?

I knew this guy for years but didn't see him for months. When we first met he was talkative and was never shy around me.

He walk past me turning his head to the side or is looking down. He adjusts his mask. When he does talk to me he can't make eye contact and have trouble getting his words out. He walks by me a bunch of times but won't say anything to me. i can tell he wants to talk to me because one time he finally came up to me and told me he wanted to talk to me. He told me he is scared of me because i'm so quiet and he doesn't know how to talk to quiet people like me but he has talk to me before and even yelled at me. We talked three times since we reconciled but he is still nervous around me.
Why is my old guy friend nervous around me?
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