Does it matter? Really? This thing is already broken, I don't think anything else he does should surprise you or make you wonder about anything. He wants you to move out, so he is going to do whatever he wants and he doesn't care about your feelings. If I were you, I wouldn't be wasting my time overanalyzing why he is looking at porn because that's the least of your problems with this relationship. In your case, I'd spend more time figuring out how to move out and stay moved out so I could have a shot at being happy for a change.