Why won’t he let me see his phone if we aren’t dating?

We lay next to each other and he gets on his phone. He never lets me look at his phone or what’s he’s doing. Before we go to bed, I’m already laying down while he is standing up on the side of his bed doing something on his phone for 15 minutes before getting in the bed. We were laying next to each other and he turns his phone away slightly From me. So when I ask if I could see his phone he tells me to let him see my phone which I do. But even after I show him mine he’s still doesn’t show me his. He says we aren’t together so what does he have to hide?

Why won’t he let me see his phone if we aren’t dating?
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