Why does my guy friend hide his phone from me?

We are friends but I think he wants to be more than friends. Whenever he's on his phone, he never wants me to look at it. He was "showing" me this funny Tik Tok once and he only wanted me to hear it, not see it. Not that I care, but he makes it a big deal.
A few days ago he was showing his friend something on his phone and I looked over at his phone to see but he moved away from me and held the phone closer to his friend.
Why does my guy friend hide his phone from me?
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