Is this guy at school very shy with us?

My friend Wendy and I know when he gets to his locker. It's when the 2nd class ends, before he heads to lunch. Let's call him Justin.

This is the 4th time we came from behind Justin (by blowing his hair) to initiate a conversation and get him to carry my friend's backpack. Wendy is more daring than me though. I only playfully tapped the shoulders and complement on how strong he is and the muscles (he does sports), which he replies ''Oh, ok, umm, thanks''. Wendy does more; she rubs her long hair on him, touches his arms, his ribcage and bottom. She talks more to him but he doesn't speak much.

We've seen Justin talk to his friends but he seems shy with us. Is he very shy with us?

Is this guy at school very shy with us?
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