If my partner just leaves his phone next to me, does it mean he’s not cheating?

Sometimes he goes for a shower, or making dinner etc.. he would leave his phone on the sofa or table
He doesn't take it with him

If he's cheating, he would always take his phone with him right?
Or not necessarily?
he's not cheating
He can still cheat
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If my partner just leaves his phone next to me, does it mean he’s not cheating?
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