My boyfriend always put his phone face down when we’re together. Is this a concern?

I noticed that every time we are together, my boyfriend puts his phone facedown. However, he does leaves his phone with me sometimes like when he’s going to the restroom. He also wears smartwatch that is connected to his phone so there are times that I see the notifications when we’re together or cuddling or sometimes let’s me know who is it. We also had the talk before that we can check each other phones if we want to. My friend said he still might be hiding something since the phone is facing down.
My boyfriend always put his phone face down when we’re together. Is this a concern?
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