How can I learn why my husband deletes everything on his phone?

We have been married for 7 years, he has never let me down. I really trust him unconditionally. But for the last week he has been on the phone all the time. Even though I didn't want to, I got suspicious and looked unfortunately. He had cleared all his call records and internet history. How can I ask him about this situation without him knowing?

How can I learn why my husband deletes everything on his phone?
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