Guys, This guy tease and actively talk to me in front of everyone but goes all quiet when we are alone, any guess what's the reason?

We had been pretty intimate (kissing and hugging) and we two always share the bed during sleepovers (making sure others are not noticing)

Guys, This guy tease and actively talk to me in front of everyone but goes all quiet when we are alone, any guess what's the reason?
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