He won’t let me check his phone, why?

A guy I’ve been sleeping with refuses to let me see his phone. We used to be serious with each other but he no longer takes me serious and all we do is have sex. When ever I’m at his house I randomly grab his phone sometimes. He’s okay with me holding it but won’t let me see it when it’s unlocked. I don’t care what’s on it because we aren’t dating and I’m just curious. He says he doesn’t let anyone see his phone.
What gets me is that he is on other people phones. He used to go through my best friend messages and dms before we met. And I let him see my messages when he asked.

He won’t let me check his phone, why?
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