Sounds like he took a "vacation" too. He and Rosy Palmer took a trip to porn island.
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Some questions, so we know more about your situation ...
Did you not know he watched porn? Did he say he didn't? Not at all? Or not when in a relationship?
Is it the names, or types of porn, that disturbs you? Was it that you weren't included?
What do you hope to accomplish with the "confrontation?" What part bothers you most out of all this?
What actions do you want to see come out of it? What actions are you prepared to take if he doesn't agree with you assessment of the situation?
You say you're fine with porn. What does it represent to you? Fun for one? Fun for both? Fun for single people only? Do you believe it has a place in a relationship, and what is that place?
Do you think leaving the PC logged in was meant to be some sort of coded message? Like, look what I did, how do you like me now.
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And completely besides porn ...
How do you think the relationship is going?
How long have you been together, your ages, your living situation, plans for the future?
How is the communication? Do you normally bring up topics that might be uncomfortable, but necessary to talk about? What kinds of reactions do you get? Blaming & yelling, or talking & compromise?