Pls explain his weird behaviour with me?

A guy i (17 yrs) just met at work (18 yrs) comes into my room every day to talk to his friend. Whilst doing so he looks a lot at me and when they are talking about sth funny he looks at my facial expression to se if im smiling. We only talked once thanks to his friend and he asked me if im still at school and how old I am.
When i said goodmorning his friend (he is old) said goodmorning back but he didn't. He even walked past me in the morning and didn't even say goodmorning either. What's goin on?
Pls explain his weird behaviour with me?
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