Is my bfs phone habits suspicious?

Been together 4 years and he’s been faithful from what I know. Since we been together he always takes his phone everywhere to the bathroom, when he sleeps and I always thought that he’s hiding something but I can always look through it when I want he gets annoyed but I do it. He sleeps with it and if I hear something in the middle of the night he will show me it’s nothing. He says he doesn’t like me going through his phone as we been together 4 years where is the trust? I know he does it when I’m not there too, we are on the phone and he will go to the bathroom and sleep with me on the phone so

That’s how he is, not suspicious
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Is my bfs phone habits suspicious?
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