How do I confront my boyfriend?

I have access to my boyfriend's email on my laptop. Sometimes when I am bored, I open it and look through the emails that he is getting. I know it is wrong but I do not have any deeper intention behind that, I am just nosy. But today I noticed an account verification email from Tinder that he got two days ago. He is currently in his hometown while I am in mine, so we are in different countries. How can I confront him about it without actually giving away the fact that I read his emails?

How do I confront my boyfriend?
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