If a guy lets a girl who is not his girlfriend use his phone?

He is the boss of my part time job, and he is around my age. Today, he passed his phone to me, gave me his password and told me to look out for customers' messages for him. I know it is for work, but it is his personal phone which he uses for personal stuff too. Is it just me or is this too trusting of him?

If a guy lets a girl who is not his girlfriend use his phone?
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