Is it bad that he puts his phone face down?

Is he hiding something? He has done this from the beginning. His phone habits are: has many uses for it, uses it but can leave it home when we go out and he doesn't take it with him to the bathroom usually, but that doesn't mean he never uses it or is hiding something, does it? I made mention of his phone being face down and he got really upset and annoyed and I just played it off like it being about his screen protector.
Is it bad that he puts his phone face down?
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