IMHO you should act AS IF about it. I think there's actually something good here in that he felt able to be open with you about it all, the conversation and the fact he has it (why he felt he needed to tell you like that- maybe he didn't feel he needed to confess; maybe he sees having it as a normal part of being a bloke?). Men are totally different from women when it comes to s*x, so I don't know, I#d be inclined to put it to one side for now and deal with it as your R progresses through an open discussion.
I don't think it's a good idea to punish him for mentioning it, or to penalise him for using it while you guys have been apart. Better than an OW? Different, I guess. Reward him for calling and texting you, and maybe when the time is right mention your concerns about the porn to him. I know it's hard but try not to see it as a reflection on you. For most men it's a physical thing while they're on their own (IMHO). I don't think it HAS to lead to addiction.....
Just my �0.02, anyway. I'm so pleased that he called you and was able to discuss things in so much detail with you (even though a bit was bleugh). Also, how great that he texted you so many times to say he enjoyed last night- that's fantastic!!
