Guys, Dude acts different with me alone and around other people?

He barely talks to me 1 on 1. And if we talk the conversations are just awkward-ish. We don't even really look at each other or face each other.

But as soon as others join us he will tease me like we have been friends for years or an old married couple and will be super talkactive and jolly, hold a lot of eye contact and just be super playful.

What is the reason for this strenge behaviour?

Guys, Dude acts different with me alone and around other people?
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