Welcome to the forum.

I won't lie, but a guy looking at porn even when in a committed relationship is totally normal. It's to the point where I think I'd be more shocked to hear a guy doesn't look at something.

However, it's important to understand he probably doesn't compare you to porn stars, and is probably genuine in his comments about your looks. It sounds like you've got a good thing going, so try to take confidence from him, as for most this behaviour is normal.